ML18024B048

Forwards Evaluation of Environ Effects on Nonsafety-Related Sys Resulting from Postulated High Energy Pipe Failures Inside & Ouside Primary Containment, in Response to 790917 Ltr & IE Info Notice 79-22

ML18024B048
Person / Time
Site:	Browns Ferry
Issue date:	10/09/1979
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML18024B049	List: ML18024B048 ML18024B050
References
NUDOCS 7910120143
Download: ML18024B048 (3)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTE (R IDS)

ACCESSION NBR 79101201 ~3 . DATE: 79/10/09 NOTARIZED-. YES DOCKET FAC IL: 50-259 Browns Ferry Nuclear Power Stations Unit ii Tennessee 05000259 rowns'erry Nuclear Power Stations Unit 2i Tennessee 05000260 50-296 owns Ferry Nuclear Power Stations Unit 3i Tennessee 05000296 A . AM AUTHOR AFFILIATION ILLS'. M. Tennessee Valley Authority ECIP. NAME RECIPIENT AFFILIATION DENTONs H. R. Of f ice of Nuclear Reactor Regulation

SUBJECT:

Forwards "Evaluation of Environ Effects on Nonsafetg-Related Sgs Resulting from Postulated High Energy Pipe Failures Inside h Ouside Primary Containmenti" in response to 790917 ltr 8c IE Info Notice 79-22..

DISTRIBUTION CODE: A038S COPIES RECEIVED: LTR ~ ENCL B SIZE: /+ /+

TITLE: Resp 9/17/79 Denton Ltr-Interact Sf tg Qrd e Sg s 5 Non-Sg s NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE'/NAME LTTR ENCL ACTION: 5 BC g 4 4 INTERNAL: EQ FU1 E 1 10 ENGR BR 1 1 1,1 REAC SFTY hR 1 1 12 I5E 2 2 14 EEB 1' 15 EFLT TRT SYS 1 1 16 OELD' 1 1, 2 NRC, PDR 1 1.,

LPDR 1 1 5 M'ROTENHUIS 1 6 T MARSH 1, 1'. 7' ROSENTHAL 1. 1 8 W MORRIS 1 1 9'ORE PERF BR 1 1 PLA4< spy. Mt t EXTERNAL: 17 ACRS 16 16 4 NSIC 1 -1 OCT l51978 TOTAL NUMBER OF COPIES REQUIRED: LTTR 36 ENCL 36

400 Chestnut Street Tower II October 9, 1979 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. Denton:

In response to IE Information Notice 79-22 and your September 17, 1979, letter to all operating light ~ater reactors regarding a potential unreviewed safety question on interaction between nonsafety grade systems and safety grade systems, we are enclosing the results of our evaluation for the Browns Ferry Nuclear Plant. This evaluation was performed using guidance and clarification provided in a meeting with the NRC staff held in, Bethesda,. Maryland, on September 20, 1979.

The General Electric= Company (GE) has provided TVA with a generic evaluation of BWR's. We have reviewed this evaluation and, although the methodology used by GE differs from that used by TVA, we have found that the final conclusions regarding system interaction and effects. on safety systems are the same.

Based on the conclusions. of the enclosed report continued operation of the Browns Ferry Nuclear Plant is justified and the operating licenses for Browns Ferry units 1, 2, and 3 should not be modified, suspended, or revoked.

Very truly yours, TENNESSEE VALLEY AUTHORITY Nuclear Regulation and Safety Subscribed and sworn to before me this 6 day of ('~ )/cd'79.

.E cc d~DC No ary Public My Commission Expires 8

'nclosure An Equal Opportunity Employer V9slo i2o I+5

ENCLOSURE