ML19269E871

Responds to IE Bulletin 79-06A, Revision 1. Change to Tech Specs Issued 790501 to Modify Safety Injection Logic to Two Out of Three Low Pressurizer Pressure.Mod of Logic Made 790502 on Unit 1 & 790508 on Unit 2

ML19269E871
Person / Time
Site:	Prairie Island
Issue date:	05/18/1979
From:	Wachter L NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
IEB-79-06A, IEB-79-6A, TAC-13126, TAC-13127, NUDOCS 7906290752
Download: ML19269E871 (1)

Text

NSD  %

NORTHERN STATES POWER COMPANY MIN N E A PO LI S. MIN N E SOTA 55401 May 18, 1979 Mr. James G. Keppler Director - Region III Office of Inspection and Enforcement United States Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

PRAIRIE ISLAND TJCLEAR GENERATING PLAhT Dockets No. 50-282 and No. 50-306 In response to Item 13 of IE Bulletin 79-06A - Revision 1, the following is offered:

Item 13 A change to Technical Specifications was proposed to change safety injection logic to two-out-of-three low pressurizer pressure. The change was issued May 1, 1979. Modification of the logic was made May 2 on Unit 1 and on May 8 on Unit 2.

A setpoint change was implemented raising the interlock setpoint for enabling actuation of the pressurizer power-operated relief valves from 2185 to 2335 psig so that failure of a single pressure channel will not cause valve opening. That is, two channels (instead of one) must provide high pressiire signals for valve actuation.

Yours very truly, L. J.' Wachter L ce President Power Production and System Operation cc: Mr. G. Charnoff NRC Office of Inspection and Enforcement Washington, D.C.f} ))j J 211979 7006290 M I}}