ML17276B092

Confirms Automatic Depressurization Sys Operation,Per Telcon W/T Collins.Valves Are Divided Into Div,Each W/ Separate Dc Station Battery

ML17276B092
Person / Time
Site:	Columbia
Issue date:	02/11/1982
From:	Bouchey G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Schwencer A Office of Nuclear Reactor Regulation
References
GO2-160, NUDOCS 8202260175
Download: ML17276B092 (4)

Text

I REGULATORY I RMATION DISTRIBUTION SYSl (RIDS)

ACCESSION NBR ~ 8202260175 DOC ~ DATE: 82/02/11 NOTARIZED:

NO DOCKET FACIL:50-397 WPPSS Nuclear Projects Unit 2E Washington Public Powe 05000397

'AUTH BYNAME AUTHOR AFFILIATION BOUCHEY<G.D.

Is'ashington Public Power Supply System

'REC IP ~ NAME RECIPIENT AFFILIATION SCHWENCEREA ~

Licensing Branch 2

SUBJECT:

Confirms automatic depressurization sys operationiper telcon w/T Collins. Valves are divided into divEeach w/

separate dc stateion battery'ISTRIBUTION CODE:

B001S COPIES RECEIVED:LTR

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PDR Washington Public Power Supply System P.O. Box 968 3000 George Washington Way Richland, Washington 99352 (509) 372-5000 February ll, 1982 G02-82-160 SS-L-02-PLP-82-004 Docket No. 50-397 Mr. A. Schwencer, Chief Licensing Branch No.

2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.

20555 8PecP~@g Q

PE8 e~ ~~1Segg n~

at JP

Subject:

NUCLEAR PROJECT NO.

2 CONFIRMATION OF AUTOMATION DEPRESSURIZATION SYSTEM (ADS) OPERATION Per a telephone conversation with Mr. T. Collins (NRC staff) the following aspects of ADS operation are confirmed:

The ADS valves are divided into two (2) divisions, one division of three valves, the other of four valves.

In case of loss of normal air supply, two separate headers are supplied from the back up supply.

Each header has its own stepping programmer and its own bank of nitrogen bottles.

A one-hundred day supply is available for long term operation.

Each division of ADS valves is supplied from the corresponding D.C.

power division (station battery).

Therefore, a single electric failure cannot disable both ADS divisions.

~

No single mechanical or electrical failure can affect all seven ADS valves simultaneously.

Yery truly yours, G.

D. Bouch Deputy Director, Safety and Security PLP/jca cc:

R Auluck NRC WS Chin

- BPA T

Collins -

NRC R

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