2008 ISOE International ALARA Symposium
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2008 ISOE International ALARA Symposium. Dose reduction actions in Tsuruga-2 NPP. The Japan Atomic Power Company. Hiroshi WADA, Yuuichi HAMANAKA, Masayuki FUKUDA Tomomi YOSHINAGA, Eiji SANEHIRA,Masahiro YANO, Yasuo UNI, Kazushige HAYASHI Fumitoshi NAKAO.

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Dose reduction actions in Tsuruga-2 NPP

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Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Dose reduction actions

in Tsuruga-2 NPP

The Japan Atomic Power Company

Hiroshi WADA, Yuuichi HAMANAKA, Masayuki FUKUDA

Tomomi YOSHINAGA, Eiji SANEHIRA,Masahiro YANO,

Yasuo UNI, Kazushige HAYASHI

Fumitoshi NAKAO

NUCLEAR PLANT SERVICE ENGINEERING Co.,Ltd.

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Contents

2008 ISOE International ALARA Symposium

Contents

  • Outline of JAPC

  • Transition of dose in Tsuruga-2 NPP

  • Dose reduction actions so far

  • Action to large-scale work

  • Situation of countermeasure for reducing radiation exposure

  • Electric personnel dosimeter

  • Conclusion

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Outline of JAPC’s NPP

Tsuruga-1 (BWR)

357 MW

Tsuruga-2 (PWR)

1160 MW

Tokai (GCR) (Decomi. phase)

Tsuruga-3 and 4 (PWR) (Currently planed)

Tokai II (BWR)

1,100 MWe

JAPC Total 2,617 MWe

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Reactor containment

Steam generator (SG)

To turbine

pressurizer

From condensor

Cold leg

MCP

Nuclear reactor

Outline of Tsuruga-2 NPP

  • Entering into the reactor containment is limited in operation condition.

  • Many equipments containing radioactivity are opened every periodical outage for inspection or maintenance.

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Transition of dose in Tsuruga-2

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Dose reduction action so far (1/4)

  • Design and Construction phase

  • Commercial operation phase

  • Action to hardware and software

  • Recent action

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Dose reduction action so far (2/4)

  • Action in design and Construction phase

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Dose reduction action so far (3/4)

  • Action in operation phase(1/2)

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Dose reduction action so far (4/4)

  • Action in operation phase(2/2)

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Recent action to hardware

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Recent action to software

Contractor

JAPC

RP

Maintenance

Maintenance

RP

Review of work contents and radiation dose

Disapproval

Work plan

Design

Work Plan Annual dose

Shielding,

Decon.

Prediction, Assessment

Cost plan

Validity

check /review

Check,

Review

Rad. work plan

Work Start

Approval

Work control Radiation control

Possibility of planned dose significant exceedance

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Action to large-scale work (1/5)(SG nozzle stub weld mending)

Steam (to turbine)

SG

From condenser

SG lower shell

(High dose rate)

SCC at nozzle welds

From reactor

to reactor

MCP*

(High dose rate)

* MCP: Main Coolant Pipe

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Action to large-scale work (2/5)(Work plan)

SG coolant inlet nozzle

SG lower shell

(High dose rate)

Nozzle stub

MCP*

(High dose rate)

Contaminated

Contaminated

Cutting

Contaminated

Elbow replacement

Cutting

* MCP: Main Coolant Pipe

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Action to large-scale work (3/5)(Planned dose)

Shielding

Decontamination

Automatic and remote

equipment

Mock-up training

1600 man-mSv

(planned)

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Action to large-scale work (4/5)(action plan based on 1100 man-mSv)

24 mSv/h

Shielding

(additional)

MCP

4.7 mSv/h

6 mSv/h

Cutting off elbow

Decontamination (additional)

Shielding

(additional)

3.7 mSv/h

1.5 mSv/h

2.8 mSv/h

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Action to large-scale work (5/5)(Reexamined plan )

Shielding

Decontamination

Automatic and remote

equipment

Mock-up training

1600 man-mSv

(planned)

Additional shielding

Additional

decontamination

1100 man-mSv

(approved)

Dose for additional dose reduction ~ 20 man-mSv

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Situation of countermeasure for reducing radiation exposure

  • Situation of installation of shield

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Situation of installation of shield 1 3

screen-type shield

Screen-type shield for watchmen

2008 ISOE International ALARA Symposium

Situation of installation of shield (1/3)

Decontamination of MCP and SG nozzle inner surface

Screen-type shield

Shield

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Situation of installation of shield 2 3

Shielding for MCP Nozzle inside

Shielding for SG nozzle inside

2008 ISOE International ALARA Symposium

Situation of installation of shield (2/3)

・Shield for MCP nozzle inside

Shield for SG nozzle inside

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Situation of installation of shield 3 3

・Shield for RHR/SIS piping

2008 ISOE International ALARA Symposium

Situation of installation of shield (3/3)

Cold-leg, Charge, Boric acid injection, Accumulator injection piping

RHR piping

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Dose reduction actions in tsuruga 2 npp

2008 ISOE International ALARA Symposium

Result of dose rate reduction

24 mSv/h

MCP

Cutting off elbow

6 → - mSv/h

4.7 → 9.0 mSv/h

Shielding

(additional)

Shielding

(additional)

1.5 → 0.9 mSv/h

3.7 → 6.0 mSv/h

2.8 → 1.6 mSv/h

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Situation of training by using mock up

2008 ISOE International ALARA Symposium

Situation of training by using mock-up

Installation of beveling machine

Installation of cutting machine

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Wireless monitoring unit of the e p d

2008 ISOE International ALARA Symposium

Wireless monitoring unit of the E.P.D

  • Enable working without relying on the alarm

Detail will be shown in another presentation of JAPC.

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Result

2008 ISOE International ALARA Symposium

Result

~1100

~990

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Conclusion 1 2

2008 ISOE International ALARA Symposium

Conclusion (1/2)

  • Effective shielding and decontamination based on technical evaluation

  • Strictly mock-up training in works

  • Maintenance section is very cooperative for the matter which radiologicalprotection section recommends in JAPC and MHI.

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


Conclusion 2 2

2008 ISOE International ALARA Symposium

Conclusion (2/2)

  • Positive inflection of the machinery automation and remoteness

  • Carrying out the radiation survey finely and limit an entrance to work area strictly

  • System which cooperated from a plan stage of the construction has begun to be seen.

The following materials may contain JAPC’s proprietary and confidential information; and all or any part of these materials or information

contained herein may NOT be used for any purposes other than originally intended or may NOT be reproduced, disclosed, transferred, distributed or

in any manner transmitted in any tangible, electronic or any other form to any third party without prior written consent thereto by JAPC.


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