ML20138R166

Forwards Results of Survey Conducted to Determine Other Plants W/Similar Svc Water Sys.Byron Sys Has Only Two Pumps & Main Contributor to High Melt Frequency.No Other Westinghouse Plants Had Problem.Info Notice Will Be Issued

ML20138R166
Person / Time
Site:	Byron
Issue date:	12/18/1985
From:	Noonan V Office of Nuclear Reactor Regulation
To:	Thompson H Office of Nuclear Reactor Regulation
References
NUDOCS 8512300587
Download: ML20138R166 (3)

Text

. DEC 181985 MEMORANDUM FOR: Hugh L. Thompson, Jr. , Director Division of PWR Licensing-A FROM: Vincent S. Noonan, Director PWR Project Directorate #5 Division of PWR Licensing-A

SUBJECT:

SURVEY ON [SSENTIAL SERVICE WATER PUMPS (BYRON PROBLEM)

A survey of Westinghouse plants was conducted to determine if there were other plants with a service water system similar to Byron. The Byron service water system, having only two pumps per unit (Unit 2 is not yet operating) is the main contribution to a high melt frequency estimated from recent PRA studies.

The results of the survey are included in the enclosure. None of the Westinghouse operating plants has the immediate problem encountered on Byron.

We are planning to request that IE send an Information Notice to all PWRs regarding this issue.

We are currently surveying the 8 & W and Combustion Engineering plants for the same purpose. Results of this survey will be reported in a future memorandum.

Vincent S. Noonan, Director PWR Project Directorate #5 Division of PWR Licensing A Distribution:

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MC 18 505 MEMORANDUM FOR: Hugh L. Thompson, Jr., Director Division of PWR Licensing-A FROM: Vincent S. Noonan, Director PWR Project Directorate #5 Division of PWR Licensing-A

SUBJECT:

SURVEY ON ESSENTIAL SERVICE WATER PUMPS (BYRON PROBLEM)

A survey of Westinghouse plants was conducted to determine if there were other plants with a service water system similar to Byron. The Byron service water system, having only two pumps per unit (Unit 2 is not yet operating) is the main contribution to a high melt frequency estimated from recent PRA studies.

The results of the survey are included in the enclosure. None of the Westinghouse operating plants has the imediate problem encountered on Byron.

We are planning to request that IE send an Infonnation Notice to all PWRs regarding this issue.

We are currently surveying the B & W and Combustion Engineering plants for the same purpose. Results of this survey will be reported in a future memorandum.

Vincen S. Noonan, Director PWR Project Directorate #5 Division of PWR Licensing-A

,d RESULTS OF ESSENTIAL SERVICE WATER SYSTEM 4

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Plant Number of ESW Pumps Diablo Canyon 1/2 Two pers unit, cross-tie between units i

Salem 1/2 Six per unit i Summer Three i

Cook 1/2 Two per unit plus shared swing pump

' McGuire 1/2 Two per unit, cross-tie between units Catawba 1/2 Two per unit, cross-tie between units (Unit 2 pumps operable although Unit 2notlicensed)

Watts Bar 1/2 Four per unit Sequoyah Four per unit

Vogtle 1/2 Six per unit

Callaway 1/2 Three per unit (normal SW has two per unit) l Wolf Creek Three (normal SW has two per unit) i Zion 1/2 Two per unit, cross-tie between units l Yankee Rowe Two, backup from fire water system (but noRCPseals)

, Ginna - Four l

Point Beach 1/2 Three per unit Prairie Island 1/2 Two per unit, cross-tie between units plus third swing pump Kewaunea Four l SONGS-1 Two, backup from screenwash pumps and aux.

saltwater pump Trojan Three i Turkey point 1/2 Three per unit '

Robinson 2 Four Farley 1/2 Five per unit Beaver Valley 1 Three North Anna 1/2 Two per unit, cross-tie between units plus aux. SW pumps Surry 1/2 Two per unit, cross-tie between units Harris 1 Two plus emergency SW pumps Indian Point 2/3 Six per unit )

Braidwood 1/2 Two, same design as Byron Comanche Peak 1/2 Two per unit, cross-tie between units Millstone 3 Four Seabrook 1/2 Four per unit South Texas 1/2 Three per unit ,

Haddan Neck Four l

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