NRC-84-2332, Final Part 21 & Deficiency Rept (NCR-84-2332),Item 198 Re Brasch Mfg Co Electric Heating Coil Air Flow Switches W/Limited Operation Temp.Initially Reported on 850117.Vendor Replaced Switches

Final Part 21 & Deficiency Rept (NCR-84-2332),Item 198 Re Brasch Mfg Co Electric Heating Coil Air Flow Switches W/Limited Operation Temp.Initially Reported on 850117.Vendor Replaced Switches

ML20116F871
Person / Time
Site:	Harris
Issue date:	03/29/1985
From:	Parsons R CAROLINA POWER & LIGHT CO.
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
CON-NRC-341, CON-NRC-84-2332, REF-PT21-85, REF-PT21-85-205-000 (NCR-84-2332), 198, NCR-84-2332, PT21-85-205, PT21-85-205-000, NUDOCS 8505010270
Download: ML20116F871 (5)

Text

.,

, ,' c e C9&L Carolina Power & Light Company 35 Ara i nil ; I C P.O. BOX 101, New Hill, NC 27562 March 29,1985 Dr. 3. Nelson Grace NRC-341 United States Nuclear Regulatory Commission Region II 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 our final report on the subject item which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21, on January 17, 1985. With this report, Carolina Power and Light Company considers this matter closed, if you have any questions regarding this matter, please do not hesitate to contact me.

Yours very truly, 9// W R. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP/ sac Attachment cc: Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)

Mr. R. C. DeYoung (NRC) 8505010270 850329 PDR ADOCK 05000400

, 8 PDR XEX-rt-6/1-OS5 __

m I

CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT 1 FINAL REPORT AIR FLOW SWITCHES FOR ELECTRIC HEATING COILS ITDI NO. 198 (NCR-84-2332)

March 25, 1985 REPORTABLE UNDER 10CFR50.55(e) AND 10CFR21 IBMD-WKJD04-0S4

.e

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-energite 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.

IBMD-WKJD04-OS4

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 been evaluated and found to be reportable per the pnovisions of 10CFR50.55(e) and 10CFR Part 21.

SCOPE OF PROBLEM: The deficiency involves the twenty-one identified heating coils for Unit I shipped on Furchase 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 FilB emergency exhaust systems to

• ess 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 scenarios, the air cleaning units associated with the four subject coils would discharge to the plant vent stack and could release uncontrolled effluents.

REASON q DEFICIENCY IS REPORTABLE: If left uncorrected,' failure of the air flow switch scale enclosure conld 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 would provide and install replacement glass scale enslosures as originally

. specified for SHNPP Unit One affected components. On February 21 6 22, 1985, scale enclosures per attached list were changed from Acrylic to glass by Brasch Manfacturing in accordance with their proposed resolution and therefore no further action is required.

L r

l WKJD04 1

...~ .

Casing Diff. Press.

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

• EHC-17 (1-4X-SA) SC3/Seis. Cat. 1 Negative

• EHC-18 (1-4X-SB) SC3/Seis. Cat. 1 Negative EHC-24 (IX-SA) SC3/Seis. Cat. 1 Positive EHC-26 (IX-SB) SC3/Seis. Cat. 1 Positive

• EHC-30 (IA-SA) SC3/Seis. Cat. 1 Negative

• EHC-30 (IB-SB) SC3/Seis. Cat. 1 Negative EHC-72 (IA-SA) SC3/Seis. Cat. 1 Positive EHC-72 (IB-SB) SC3/Seis. Cat. 1 Positive EHC-10 (IX-SN) NNS/Seis. Supported Not Relevant EHC-12 (IX-SN) NNS/Seis. Supported Not Relevant EHC-20 (IX-NNS) NNS Not Relevant EHC-21 (lX-SN) NNS/Seis. Supported Not Relevant EHC-23 (IX-SN) NNS/Scis. Supported Not Relevant EHC-25 (IX-SN) NNS/Seis. Supported Not Relevant EHC-101 (IX-SN) NNS/Seis. Supported Not Relevant EHC-111 (IX-SN) NNS/Seis. Supported Not Relevant EHC-ll2 (IX-SN) NNS/Seis. Supported Not Relevant EHC-Il9 (IA-SN) NNS/Seis. Supported Not Relevant EHC-119 (IP-SN) NNS/Scis. Supported Not Relevant EHC-120 (IA-SN) NNS/Seis. Supported Not Relevant EHC-120 (IB-SN) NNS/Seis. Supported Not Relevant IBMD-WKJD04-OS4

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