ML20127K529

RO 731109,discovered That During Surveillance Testing Reactor Bldg to Suppression Chamber Vacuum Breaker Check Valve Operated Improperly.Investigation in Progress

ML20127K529
Person / Time
Site:	Monticello
Issue date:	11/09/1973
From:	Larson C NORTHERN STATES POWER CO.
To:	Keepler J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 9211200426
Download: ML20127K529 (1)

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s, - Fgulatory rite cy, '(ccv'dcg0. {@ rry ,m ,

\'l3 l L. .i; k%es do-EU l NOMTHERN STATES POWER COMPANY / /

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Mr. J. G. Keppler, Regional Director 3 W3* To' Directorate of Regulatory Operations g ~, l$1]l, tin /

thited States Atomic Energy Comission aesa , l 799 Poosevelt Road g

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l Glen Ellyn, Illinois 61073 _ vs

Dear Mr. Keppler:

MMICELI4 NUCLEAR GENERATING PIM Docket No. 50-263 License No. DPR-22 On November 9,1973, it was found durinJ surveillance testing that reactor building to suppression chamber vactan breaker check valve, DNV 8-1 would not operate freely.

An investigation of the occurrence is being conducted.

4 Yourt, very tmly, 0.5. 44oeAg /6 C. E. Larson h

Plant Manager s0 Il g

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, 3 %d i cc: J F O'Imry E) l G Charnoff e g,/

Minnesota Pollution Control Agency g, l 4 Attn: Ken Dzugan & g L,

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1' NORTHERN STATES POWER COMPANY Minneapolis, Minnesota 55401 November 21, 1974 s

i Mr. J. G. Keppler, Regional Director -

Directorate of Regulatory Operations f Region III 799 Roosevelt Road Glen Ellyn, Illinois 60173 1

Dear Mr. Keppler:

FDNTICELID NLCLEAR GENERATING Pl# 6 Docket No. 50-263 License No. DPR-22 in accordance with item 2, of R0 Bulletin 74-14, the follwing information is sulaitted. _.

A review of procedures as requested in item 1, of the bulletin has been completed. A similar review had been initiated prior to receipt of the bulletin as a result of infonnation received from General Electric Company.

On November 20, 1974, criteria and instructions were added to applicable procedures to assure that:

1) Suppression pool cooling will be initiated to prevent or limit high local suppression pool temperatures,

2) The reactor will be tripped if bulk suppression pool temperature becomes excessive,

3) Reactor depressurization will be performed as necessary to limit relief valve flow rates under high suppression pool temperature conditions,

4) Visual inspections of the suppression pool structures will be conducted following extended relief valve discharges.

With these additions, the operating procedures are believed to be adequate with respect to all of the areas described in the bulletin, Yours very truly, kd L. J. Wachter Vice President-pwer Production Lj.

and System Operation Fm1 1 C n? fO '

2 7 1974 fus ts /

4 2-IJW/kik cc: Mr. J. F. O' Leary, Directorate of Licensing Mr. G. Charnoff Minnesota Pollution Control Agency Attn: E A Pryzina s.

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[go nrog% UNITED STATES '% -gQ3 l c\ 4 NUCLEAR REGULATORY COMMisslON j

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WASHINGTON, D. C. 20655 -

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June 12, 1978 '

All Power Reactor Licensees and Applicants ,

Gentlemen:

This letter and enclosed Sandia report titled "A Systematic Approach to the Conceptual Design of Physical Protection Systems for Nuclear Facilities,"

dated May.1978, are being sent to all licensees authorized to operate a  :

nuclear power reactor and to all . applicants with applications .for a license to operate or construct a power reactor.

This report describes a systematic approach to the conceptual design of physical protection systems for nuclear facilities and is provided as a reference document. Feedback on this handbook is encouraged from all recipients and should be addressed to Dr. Samuel C. T. McDowell, Assistant Director for Research and Development, Division of Safeguards and Security.

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Sincerely, > ,

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- ames R. Miller, ssistant Director for Reactor Safeguards i Division of Operating Reactors

Enclosure:

"A Systematic Approach to the Conceptual Design of Physical Protection Systems for Nuclear- .

Facilities .

cc w/o enclosure:

Service List

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4 NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555

\ .),', , June 12, 1978

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V All Power Reactor Licensees and Applicants Gentlemen:

This letter and enclosed Sandia Barrier Technology Handbook, dated November 1977, are being sent to all licensees authorized to operate a nuclear power reactor and to all applicants with applications for a license to operate or construct a power reactor.

The Barrier Technology Handbook is designed to provide state-of-the-art information on the role of barriers in security and is provided as a reference document. Feedback on this handbook is encouraged from all recipients and should be addressed to Dr. Samuel C. T. McDowell, Assistant Director for Research and Development, Division of Safeguards and Security, D0E.

Sincerely, 4,. 4 0[

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'[ Jbmes R. Miller, Assistent Director for Reactor Safeguards Division of Operating Reactors

Enclosure:

Barrier Technology Handbook cc w/o enclosure:

Service List

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