ML17313A162

Provides Summary of Major Work Activities That Have Recently Been Completed to Resolve Remaining Open Actions Re GL 92-08, Thermo-Lag 330-1 Fire Barriers

ML17313A162
Person / Time
Site:	Palo Verde
Issue date:	12/24/1997
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
102-04056-JML-S, 102-4056-JML-S, GL-92-08, GL-92-8, NUDOCS 9801050050
Download: ML17313A162 (8)

Text

CATEGORY ly REGULA Y INFORMATION DISTRIBUTION SYSTEM (RIDS)

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'CCESSION NBR:9801050050 DOC.DATE: 97/12/24 NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 w~ < gTN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 Ad'i H.1."AME AUTHOR AFFILIATION LEVINE,J.M.

Arizona Public Service Co.

(formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Provides summary of major work activities that have recently been completed to resolve remaining open actions re GL 92-08, "Thermo-Lag 330-1 Fire Barriers."

DISTRIBUTION CODE:

A029D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Generic Letter 92-008 Thermo-Lag 330 Fire Barrier NOTES: STANDARDIZED PLANT Standardized plant.

Standardized plant.

05000528g 05000529 05000530()

RECIPIENT ID 'CODE/NAME PD4-2 LA CLIFFORD,J INTERNAL. FILE C E

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RPW PD3-RGN4 FILE EXTERNAL: NOAC COPIES LTTR ENCL RECIPIENT ID CODE/NAME PD4-2 PD NRR/DE/EELB NRR/DSSA/SPLB NRC PDR COPIES LTTR ENCL D

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N NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE'DOCUMENT CONTROL

'DESK (DCD)

ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED:

LTTR 10 ENCL

Commitment. titenstflt.&eyy.

<~ Palo Verde Nuclear Generating Station James M. Levine Senior Vice President Nuclear TEL (602)393-5300 FAX(602)3934077 Mail Station 7602 P.O. Box 52034 Phoenix, AZ65072-2034 102-04056 JML/SAB/RMW December 24, 1997 U. S. Nuclear Regulatory Commission ATlN: Document Control Desk Mail Station P1-37 Washington, DC 20555-0001

References:

1.

Letter 102-03833-JMUSAB/NLT, dated December 31, 1996, from J. M. Levine, Senior Vice President, Nuclear, APS to USNRC.

2.

Letter 102-03854-WEI/SAB/NLT, dated January 24, 1997, from W. E. Ide, Vice President, Nuclear Engineering, APS to USNRC.

3.

Letter 102-03894-JMUSAB/RMW, dated March 18, 1997, from J. M. Levine, Senior Vice President, Nuclear, APS to USNRC.

4.

Letter 102-03946-WEI/SAB/RMW, dated May 30, 1997, from W. E. Ide, Vice President, Nuclear Engineering, APS to USNRC.

5.

Letter 102-04021-WEI/SAB/RMW, dated September 26, 1997, from W. E. Ide, Vice President, Nuclear Engineering, APS to USNRC.

6.

Letter 102-04026-WEI/SAB/RMW, dated October 9, 1997, from W. E. Ide, Vice President, Nuclear Engineering, APS to USNRC.

Subject:

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Palo Verde Nuclear Generating Station (PVNGS).

Units 1,2, and 3 Docket Nos. STN 50-528/529/530 Status of PVNGS Activities Associated with the Resolution of Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers".

Arizona Public Service Company (APS) has been actively pursuing completion of the activities described in the above References associated with the resolution of Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers". The following provides a summary of the major work activities that have recently been completed to resolve the remaining open actions.

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U. S. Nuclear Regulatory Commission ATlN: Document Control Desk

'- Stat'us of PVNGS Activities Associated with the Resolution of Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers".

Page 2 FIRE ENDURANCE APS has completed all work associated with upgrading the Thermo-Lag 330-1 fire barriers that are credited in the Fire Hazards Analysis.

This work also includes the modification of steam trap piping and re-installation of the Thermo-lag 330-1 fire barrier in Unit 1 that was identified in Reference 5.

AMPACITY Reference 4 stated that the ampacity evaluations that were performed for Unit 1 did not bound Units 2 and 3.

Therefore, APS committed to performing unit-specific ampacity evaluations for Thermo-Lag 330-1 enclosed raceways.

The ampacity evaluations for Thermo-Lag 330-1 enclosed raceways for all units have been completed.

As discussed in Reference 1, one instance of a Class 1E Thermo-Lag 330-1 enclosed cable with insufficient ampacity was identified.

This instance applied to all three units and represented a cable life issue, not an operability issue.

The Thermo-Lag 330-1 barriers on the affected raceways were removed in each of the units.

Sandia National Laboratories'SNL) comments with respect to the Leake Method for determining ampacities of cables in trays were provided to APS by the NRC in a letter dated September 11, 1997. The Unit 2 and 3 evaluations were revised to incorporate the SNL comments as stated in Reference 6 The existing Unit 1 ampacity evaluation performed for Thermo-Lag 330-1 enclosed trays was reviewed with respect to the SNL comments, as committed to in Reference

6. APS determined that the SNL comments have no impact on the conclusions of this evaluation and willformally incorporate these comments into the Unit 1 evaluation as part of the next appropriate revision of calculation 01-EC-ZA-300, Ampacities of Cablesin Trays.

Therefore, APS considers the cable ampacity issues associated with Thermo-Lag 330-1 fire barriers to be resolved for all three units.

COMBUSTIBILITY A fire protection engineering evaluation has been performed to demonstrate the radiant energy heat shield for the pressurizer auxiliary spray valve and associated raceway in containment meets the requirements of Appendix R,Section III.G.2.f. The information provided in the engineering evaluation, and an independent engineering study, was provided for information in Reference

3. APS considers the radiant energy heat shield to be acceptable and work associated with this issue is complete.

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U. S. Nuclear Regulatory Commission

, ATTN: Document Control Desk

. Statgs of PVNGS Activities Associated with the Resolution of Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers".

Page 3 SELF ASSESSMENT The Emergency Services Division performed an integrated self-assessment in November and

December, 1997, that critically evaluated the performance and effectiveness of the actions that APS undertook to resolve Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers".

The assessment included reviews of a sample of applicable

drawings, calculations, design basis documents, work orders, UFSAR

sections, station procedures, portions of the Fire Hazards Analysis and included associated unit walkdowns.

The assessment team included personnel from Nuclear Assurance, Operations, Emergency Services and technical consultants with extensive expertise in Thermo-Lag 330-1 related issues from San Onofre Nuclear Generating Station and Tennessee Valley Authority Watts Bar. Although several areas were identified as needing enhancements, no conditions adverse to quality were identified during this assessment.

SUMMARY

In summary, APS has resolved the issues identified in Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers", for the Palo Verde Nuclear Generating Station.

COMMITMENTSMADEAS PART OF THIS DOCUMENT

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No commitments are being made by this letter.

Please contact Mr. Scott Bauer at (602) 393-5978 if you have any questions or comments.

Sincerely, JML/SAB/RMW/rlh cc:

E. W. Merschoff J. W. Clifford J. H. Moorman K. E. Perkins

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