B12330, Advises That Util Considers Tests on Isolation Devices of SPDS Described in Successful.Acceptance Criteria for Max Credible Faults Testing to Observe No Measurable Effects on Isolator Input W/Digital Storage Scope

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Advises That Util Considers Tests on Isolation Devices of SPDS Described in Successful.Acceptance Criteria for Max Credible Faults Testing to Observe No Measurable Effects on Isolator Input W/Digital Storage Scope
ML20214H758
Person / Time
Site: Millstone Dominion icon.png
Issue date: 11/17/1986
From: Opeka J, Sears C
NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To: Thadani A
Office of Nuclear Reactor Regulation
References
TASK-1.D.2, TASK-TM B12330, TAC-51257, NUDOCS 8612010015
Download: ML20214H758 (1)


Text

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(203) 665-5000 November 17,1986 Docket No. 50-336 B12330 Office of Nuclear Reactor Regulation Attn: Mr. Ashok C. Thadani, Director PWR Project Directorate #8 Division of PWR Licensing - B U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Gentlemen:

Millstone Nuclear Power Station, Unit No. 2 Safety Parameter Display System In a letter dated October 24,1936(l), Northeast Nuclear Energy Company (NNECO) described the results of additional testing conducted for one of the isolation devices used in the Safety Parameter Display System for Millstone Unit No. 2. NNECO's acceptance critericn for the " maximum credible faults" testing was to observe no measurable effects on the isolator's inputs as monitored with a digital storage scope. As stated on page 2 of the attachment to Reference (1),

the acceptance criterion for the test was met. Therefore, NNECO considered the test to be successful.

We trust that you will find this information satisfactory.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY

,b 3.F. Opeka Senior Vice President By C.F. Sears 8 Vice President j 9i L

(1) 3.F. Opeka letter to A.C. Thadani, " Safety Parameter Display System,"

dated October 24,1986.

8612010015 061117 6 PDR ADOCK 0500 P