ML19326B416

RO 50-313/78-09:on 780413,B&W Informed Util That Analysis Results for 0.04 Ft Squared RCS Pump Discharge Break Unacceptable.Correction Action Will Be Proposed by 780417 & Operation Will Continue

ML19326B416
Person / Time
Site:	Arkansas Nuclear
Issue date:	04/14/1978
From:	Rueter D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19326B397	List: ML19326B396 ML19326B402 ML19326B406 ML19326B409 ML19326B416
References
NUDOCS 8004150778
Download: ML19326B416 (1)

Text

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1 30 sariracopy HEL9tNG BUILO AMKANSAS bh V ARK ANS AE POWE A & LIGHT COMPANY A C. SCX 551

• UTTLE AccK AnKANsAS 722C3

• C5o13 3714191 April 14, 1978 $,

CCNALO A. AUETER " C3 einecTon TELEC0PY L- C TECHNCAL ANO -

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ENWICNMENTAL sERVCES - 7 .- - k-i:2.W  ;-i 1-048-9 EEM .

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- =.a, Mr. G. L. Madsen, Acting Direc. tor y 3 ]g Office of Inspection & Enforcement p, g Region IV m .;:

U. S. Nuclecr Pasulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011

Subject:

Arkar a Nuclear One-Unit 1 Docket No. 50-313 License No. DPR-51 Reportable Occurrence Report 50-313/78-9 (File: 0520)

O Gentlemen:

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We were notified 'en April 13, 1978, by Babcock and Wilcox of the results of an analysis of a 0.04 ft2 RCS pump discharge break d ich had nct been previously analyzed and which now shows unacceptable results. ih unac-ceptable results cecur after approximately 1700 seconds when ons assumes that only one High Pressure Injection (HPI) train is working (due to single failure assumption) and that 50% of the flow from that HPI pump is not reaching the core due to flow out of the break. The analysis also shows that the RCS pressure will ramnin above the pressure at which Low Pressure Injection (LPI) flow can reach the RCS.

We are in contact with the NRC Staff (Division of Operating Reactors) in Washington and will be propcsing corrective action to them by April 17, 1978.

Due to the very low probability that such a specific event will occur and the short time required to develop corrective action,' no action is necessary to restrict operation of the unit at this time.

Very truly yours, .

, , /

,. n f s.

Donald A. Ruecer p) i v

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8 o o 415 o 77p. COPY SENT REgg; TAX A AYING. INVESTC A CWN Ec MEMBE A MtOOLE SCUTH UTILITIES SYSTEM l ,

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