ML20111B627

Part 21 & Interim Deficiency Rept,Item 198 Re Incorrect Matl Used in Brasch Mfg Co Air Flow Switches for Electric Heating Coils.Initially Reported on 850117.Glass Scale Encls Will Be Replaced by Brasch.Final Rept by 850401

ML20111B627
Person / Time
Site:	Harris
Issue date:	02/13/1985
From:	Parsons R CAROLINA POWER & LIGHT CO.
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
CON-NRC-324, REF-PT21-85, REF-PT21-85-174-000 198, PT21-85-174, PT21-85-174-000, NUDOCS 8503130168
Download: ML20111B627 (5)

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Cp&L u Carolina Power & Light Company A

/,23 P.O. BOX 101, New Hill, NC 27562 February 13,1935 Dr. J. Nelson Grace NRC-324 United States Nuclear Regulatory Commission Region 11 101 Marietta Street, Northwest (Suite 2900)

Atlanta, GA 30323 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT 1 AIR FLOW SWITCHES INCORRECT MATERIAL, ITEM 198

Dear Dr. Grace:

Attached is an interim report on the subject item which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21, on January 17, 1985. CP&L is pursuing this matter, and it is currently projected that corrective action and submission of the final report will be accomplished by April 1,1985.

Thank you for your consideration in this matter.

Yours very truly, hlghW/W R. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP/rt Attachment cci Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)

Mr. R. C. DeYoung (NRC)

$b - 400 0503130160 050213 ADOCK 0500 gDR OFFICIAL COPt l

rt-6/l 1

A CAROLINA POWER & LICHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT 1 INTERIM REPORT AIR FLOW SWITCHES FOR ELECTRIC HEATING C'ILS ITEM NO. 198 (NCR-84-2332)

FEBRUARY 8, 1985 REPORTABLE UNDER 10CFR50.55(e) AND 10CFR21 l

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SUBJECT:

Shearon Harris Nuclear Power Plant, Unit 1 10CFR50.55(e) and 10CFR21, reportable deficiency.

Air flow switches for electric heating coils purchased from Brasch Manufacturing Company under Purchase Order NY-435152.

ITEM: Air flow switches installed in HVAC electric heating coils. Total of twenty-one switches, one each in twenty-one heating coils (thirteen - not safety-related; eight - safety-related, only four of which have been determined reportable; designated by

• ). See attached list.

SUPPLIED BY: Brasch Manufacturing Company, Inc., Maryland Heights, Missouri. Air Flow Switches manufactured by Dwyer Instruments, Inc., Michigan City, Indiana, as subvendor to Brasch Manufacturing.

NATURE OF DEFICIENCY: In October, 1984, Brasch Manufacturing advised CP&L that previously shipped electric heating coils contained air flow switches with acrylic scale enclosures which limits the airflow switch maximum temperature for reliable operation to 130*F, whereas the same switch with glass scale enclosure has a 180*F rating. The switch was specified by Brasch to have glass enclosures, however, they were inadvertently ordered and shipped with acrylic enclosures. Acrylic scale enclosures, when exposed to excessive temperatures as may be experienced in a post accident environment or during testing, could warp resulting in a leak path. This would cause the airflow switch to sense ambient pressure on both sides of the diaphragm when installed in negative pressure portions of systems, which in turn would erroneously indicate loss of air flow through the electric heating coil / air cleaning unit. Such erroneous indication would de-energize the electric heating coil.

DATE PROBLEM CONFIRMED TO EXIST: Based on a letter from the vendor, dated October 22, 1984, NCR-84-2332 was issued December 5, 1984. On December 19, 1984 the item was determined to be potentially reportable.

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DATE PROBLEM REPORTED: On December 20, 1984, Mr. F. E. Strehle notified the NRC (Mr. A. Hardin) that the subject item was potentially reportable. On January 17, 1985, Mr. N.

J. Chiangi notified the NRC (Mr. A. Hardin) that the December 20, 1984 potentially reportable item had l been evaluated and found to be reportable per the provisions of 10CFR50.55(e) and 10CFR Part 21.

SCOPE OF PROBLEM: The deficiency involves the twenty-one identified heating coils for Unit 1 shipped on Purchase Order NY-435152. These heating coils have the subject airflow switches installed. (See attached list.)

SAFETY IMPLICATION: The four electric heating coils denoted by

• are provided to limit effluent humidity through the RAB and FHB emergency exhaust systems to less than 70%

RH. Upon failure of the subject heating coils, the effluent could reach 100% RH thereby saturating the charcoal adsorbers. Excessive relative humidity severly reduces the charcoal adsorber efficiency.

During applicable post accident senarios, the air cleaning units associated with the four subject coils would discharge to the plant vent stack and could release uncontrolled effluents.

REASON DEFICIENCY IS REPORTABLE: If left uncorrected, failure of the air flow switch scale enclosure could result in off-site exposures of radioactive effluent in excess of 10CFR100 limits.

CORRECTIVE ACTION: Brasch Manufacturing indicated in their letter dated October 22, 1984 that they will provide and install replacement glass scale enslosures as originally specified for all SHNPP Unit One affected components.

FINAL REPORT: It is anticipated that replacement of the scale enclosures will be completed before April 1, 1985.

It is projected that the final report will be issued at that time.

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! Casing Diff. Press.

l EHC Tag No. Safety Classification W.R.T. Ambient

• EHC-17 (1-4X-SA) SC3/Seis. Cat. 1 Negative l *EHC-18 (1-4X-SB) SC3/Scis. Cat. 1 Negative f EHC-24 (1X-SA) SC3/Seis. Cat. 1 Positive EHC-26 (1X-SB) SC3/Seis. Cat. 1 Positive

• EHC-30 (IA-SA) SC3/Seis. Cat. 1 Negative l *EHC-30 (1B-SB) SC3/Seis. Cat. 1 Negative l

i EHC-72 (1A-SA) SC3/Seis. Cat. 1 Positive EHC-72 (IB-SB) SC3/Scis. Cat. 1 Positive EHC-10 (IX-SN) NNS/Seis. Supported Not Relevant EHC-12 (1X-SN) NNS/Seis. Supported Not Relevant EHC-20 (1X-NNS) NNS Not Relevant EHC-21 (1X-SN) NNS/Seis. Supported Not Relevant EHC-23 (1X-SN) NNS/Seis. Supported Not Relevant EHC-25 (1X-SN) NNS/Seis. Supported Not Relevant i

j EHC-101 (1X-SN) NNS/Scis. Supported Not Relevant l EHC-111 (1X-SN) NNS/Seis. Supported Not Relevant

! EllC-112 (1X-SN) NNS/Seis. Supported Not Relevant EHC-119 (1A-SN) NNS/Seis. Supported Not Relevant EHC-119 (1B-SN) NNS/Seis. Supported Not Relevant i

i EHC-120 (IA-SN) NNS/Seis. Supported Not Relevant EHC-120 (1B-SN) NNS/Seis. Supported Not Relevant l

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