05000327/LER-1981-101-01, /01T-0:on 810820,discovered That Essential Raw Cooling Water Sys Would Not Provide Proper Flow Requirements Under Certain Conditions.Caused by Design Deficiency.Mods Made to safety-related Equipment

/01T-0:on 810820,discovered That Essential Raw Cooling Water Sys Would Not Provide Proper Flow Requirements Under Certain Conditions.Caused by Design Deficiency.Mods Made to safety-related Equipment

ML20010F298
Person / Time
Site:	Sequoyah
Issue date:	09/02/1981
From:	Harding M, Romine D TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010F294	List: 05000327/LER-1981-101, Forwards LER 81-101/01T-0 05000327/LER-1981-101-01, /01T-0:on 810820,discovered That Essential Raw Cooling Water Sys Would Not Provide Proper Flow Requirements Under Certain Conditions.Caused by Design Deficiency.Mods Made to safety-related Equipment
References
LER-81-101-01T, LER-81-101-1T, NUDOCS 8109100014
Download: ML20010F298 (2)

LER-1981-101, /01T-0:on 810820,discovered That Essential Raw Cooling Water Sys Would Not Provide Proper Flow Requirements Under Certain Conditions.Caused by Design Deficiency.Mods Made to safety-related Equipment

Event date:
Report date:
3271981101R01 - NRC Website

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6 o-LEA SUPPLEMENTAL INFORMATION SQRO-50-327/81101

' Technical Specification Involved:

6.9.1.12.1 Reported Under Technical Specification:

6.9.1.12.1 Date of Occurrence: 08/20/81 Time of Occurrence:

1205 CDT Identification and Descriptios of Occurrence During a s[ecial investigation, it was discoverca that certain manual operator actions are required following an accident to realign the ERCW system for.long-te n cooling. The present design on the ERCW component cooling system heat exchanger "C" discharge valve, 0-FCV-67-152, allows it to go 100% open upon receiving an SI signal. Flow requirements' for.the ERCW system demand that this valve go only 35% open. Also the flow requirements for the component cooling sys tem nes t exchanger "A" and "B", 1-FCV-57-146 and 2-FCV-67-146 respectively, which depend on various combinations of unit 1 and 2 operating modes, were not addressed in the plant Emergency Operating Instructions.

In the wors t case, it is possible the following safety related equipment would have received less ERCW flow than assured in the analysis of the system:

(1) Diesel Generator-(2) Containment Spr.

Hx's (3) Emergency Gas Treatment System Room Cooler (4) Centrifugal Charging Pump Room and Oil Coolers (5) Safety Injection Pump Room and 011 Coolers (6) Containment Spray and RHR Room Coolets (7) Electrical Board Room and Main Control Room Air Conditioning Condensers Conditions Prior To Occurrence Unit 1 in mode 1 at 100% RTP Apparent Cause of Occurrence Design Deficiency

Corrective Action

Modifications have been made to 0-FCV-67-152 so the valve will go only 35% open upon receiving an SI signal. Also the Emergency Operating Instructions have been revised to reflect the valve positions for 1-FCV-67-146 and 2-FCV-67-146.

The modification on 0-FCV-67-152 was made prior to unit 1 entry into mode 3.

Failure Data N/A