ML20073C708

Interim Deficiency Rept SD-370/83-01 Re Auxiliary Feedwater Flow Transmitters Failing Environ Qualifications.Initially Reported on 830228.Transmitters to Be Replaced W/ Environmentally Qualified Transmitters Prior to Mode 3

ML20073C708
Person / Time
Site:	Mcguire
Issue date:	03/31/1983
From:	Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, SD-370-83-01, SD-370-83-1, NUDOCS 8304130278
Download: ML20073C708 (3)

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• DUKE POWER GOMPANY I*.O. ISOK 33180 CllAlaLOTTE, N.O. 28242 II AL II. TI!CKER TELEPHONE m m emesinent (704) 373-4531 l

March 31, 1983 $ 'q '

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Mr. James P. O'Reilly, Regional Administrator -

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U. S. Nuclear Regulatory Commission . 21 Region II

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Doc 1 - No. 50-370

Dear Mr. O'Reilly:

Pursuant to 10 CFR 50.55e, please find attached Significant Deficiency Report SD-3*s0/83-01 concerning auxiliary feedwater flow transmitter environmental qualification deficiencies.

Very truly yours, B. fm L ff,j Hal B. Tucker PBN:j fw Attachment ec: Directcr Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Mr. W. T. Orders Senior Resident Inspector McGuire Nuclear Station OFFICIAL COPY.I .J 8304130278 830331 PDR ADDCK 05000370 -7d'~ A [

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" . DUKE POWER COMPANY .

McGUIRE NUCLEAR STATION SIGNIFICANT DEFICIENCY REPORT NUMBER: SD-370/83-01 REPORT DATE: March 31, 1983 FACILITY: McGuire Unit 2 IDENTIFICATION OF DEFICIENCY:

The existing auxiliary feedwater flow transmitters, located in the doghouses, are not qualified for the 330 degree F main steam break environment. This deficiency was identified February 28, 1983.

INITIAL REPORT:

On March 1,1983, A Ignatonis, NRC Region II, Atlanta, Georgia, was notified of the subject deficiency by W. O. Henry and D. L. Canup of Duke Power Company, 422 South Church Street, Charlotte, North Carolina 28242.

COMPONENT AND/0R SUPPLIER:

Barton Model 386A Class 1E electronic differential pressure transmitters. .

DESCRIPTION OF DEFICIENCY:

The subject deficiency involves four safety-related auxiliary feedwater flow trans-mitters, one per steam generator. These transmitters are located in the inboard and outboard doghouses (main steam and feedwater isolation valve enclosures), for which a main steam break environment of 330 degrees F exists. The existing Barton 386A's are not qualified for this environment.

This instrumentation is identified in McGuire Technical Specification Table 3.3-10 as accident monitoring instrumentation. Safety-related operating procedures rely on this instrumentation for post-accident monitoring of auxiliary feedwater flow. Availability of adequate auxiliary feedwater is a prerequisite for terminating safety injection.

This instrumentation was added in response to NUREG 0578, which required safety-grade control room indication of auxiliary feedwater flow to each steam generator. At the time of this addition, the function of this instrumentation in a harsh environment was-not identified. Subsequently, use of this instrumentation was incorporated into safety-related operating procedures. However, the transmitters were overlooked in the review done in response to NUREG 0588. The problem was discovered in a recent review in response to the new environmental qualification ruling 10CFR50.49.

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• REPORT NUMBER: SD-370/83-01 Page Two ANALYSIS OF SAFETY IMPLICATIONS:

McGuire safety-related operating procedures rely on these flow transmitters for post-accident monitoring of auxiliary feedwater flow. Availability of adequate auxiliary feedwater flow is a prerequisite .for terminating safety injection.

Other safety-related control room instrumentation exists sufficient for evaluating auxiliary feedwater supplied to each steam generator, e.g., redundant steam generator level instrumentation However, loss of the flow transmitters due to high temperatures following an accident could mislead the operator into making a decision resulting in plant failure to meet minimum required safety functions.

CORRECTIVE ACTION:

The existing auxiliary feedwater flow transmitters are being replaced with environ-mentally qualified transmitters. Rosemount Model 1153 Series D Class 1E transmitters have been procured. They will be installed on McGuire Unit 2 prior to Mode 3 operation.

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