IR 05000461/1989023
| ML20245J039 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 06/21/1989 |
| From: | Cooper R, Gardner R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML20245H964 | List: |
| References | |
| 50-461-89-23-EC, NUDOCS 8906300168 | |
| Download: ML20245J039 (16) | |
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U.S. NUCLEAR REGULATORY COMMISSION
REGION III
i Report No. 50-461/89023(DRS)
Docket No. 50-461 License No. NPF-62 Licensee:
Illinois Power Company 500 South 27th Street Decatur, IL-62525 Facility Name:
Clinton Power Station Meeting At: Region III Office, Glen Ellyn, Illinois
~ Meeting Conducted:
June 14, 1989 Type of Meeting: - Enforcement Conference U hk
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b Inspector:
R. N. Gardner Date b-bh Q
Approved By:
R. W. Cooper, II, Chief ([.2////
Engineering Branch Date /
Meeting Summary Meeting on June 14, 1989 (Report No. 50-461/89023(DRS))
Matters Discussed: Apparent violation of 10 CFR 50.49, Paragraphs (f) and (g)
~in regard to hydrogen igniter field connections, instrument circuits landed on terminal blocks in GE instrument racks, SRV solenoid valve leads, limit switches on a damper assembly, and electrical penetrations enclosures.
The analysis and disposition of the apparent violation will be presented in subsequent communications.
8906300168 890623
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DETAILS
'1.
Persons Contacted a.
Illinois Power Company (IPCo)
J. S. Perry, Assistant Vice President R. D. Freeman, Manager, NSED R. E. Campbell, Manager, QA D. L. Holtzcher, Acting Manager, Licensing and Safety J. A. Miller, Manager, Scheduling and Outage Management b.
Consultants G. L. Edgar, Attorney, Newmann and Holtzinger R. J. Lauer, Attorney, Schiff, Hardin and Waite S. Frantz, Attorney, Newman and Holtzinger c.
U.S. Nuclear Regulatory Commission (USNRC)
C. J. Paperiello, Deputy Regional Administrator H. J. Miller, Director, DRS J. Lehman, Office of Enforcement (telephonically)
J. B. Hickman, Project Manager, NRR J. A. Grobe, Director of Enforcement R. N. Gardner, Chief, PSS A. S. Gautam, NRR B. Wiseman, Office of General Counsel (telephonically)
S. Ray, Resident Inspector (Clinton)
M. Ring, Projects Section Chief (Clinton)
R. W. Cooper, II, Chief, Engineering Branch, DRS R. C. Knop, Projects Branch Chief 2.
Enforcement Conference As a result of an apparent violation of NRC requirements, an Enforcement Conference was held in the Region III Office on June 14, 1989.
The preliminary findings, which were the bases for this apparent violation of NRC requirements, were documented in NRC Inspection Report No.
50-461/89014(DRP) and were transmitted to the licensee by letter dated June 12, 1989. The attendees of this Conference are noted in Paragraph 1 of this report.
The purpose of this conference was to discuss:
a.
The safety significance of the EQ discrepancies identified in the following plant equipment:
(1) Hydrogen Igniters
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(3) Solenoid (ASCO) Valve Leads l-(4) Damper Assembly on the Standby Gas Treatment System I
(5) Electrical Penetration Enclosures (i.e., the construction of the i
enclosures could subject the terminal blocks to direct spray for which the terminal blocks are not environmentally qualified),
b.
A summary of action taken i.o correct the above discrepancies as i
outlined in the May 16, 1989 IP Letter to Region III, " Environmental
Qualification Issues at Clinton Power Station."
In opening the conference, the NRC representatives identified the following l
' apparent violation of 10 CFR 50.49, Paragraphs (f) and (g) (see Attachment 1):
l 10 CFR 50.49, Paragraphs (f) and (g):
Failure to environmentally qualify the f ollowing 10 CFR 50.49 designated equipment by test and/or analysis.
(1). Hydrogen igniter field connections (2)
Instrument circuits landed on terminal blocks in GE instrument racks
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l (3) SRV solenoid valve leads
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(4) Limit switches on damper assembly (5) Electrical penetration enclosures with top entry cable penetrations or warped with bottom entry cable penetrations The licensee presented a summary of their review of the EQ discrepancies including root cause analysis and corrective actions taken. The licensee also discussed the safety significance of the EQ discrepancies (see Attachment 2)..
In addressing safety significance, the licensee stated that, based on engineering judgement, the hydrogen igniters and the instrument circuits landed on terminal blocks in the GE instrument racks and in the electrical penetration enclosures would have performed satisfac-torily in an accident.
However, the licensee indicated that the Automatic Depressurization System and one of the two 100% capacity Standby Gas Treatment System (SGTS) filter trains would not have been available in a postulated accident. The licensee also stated that the remaining SGTS filter train had, on occasion, been out of service during previous plant operations.
The NRC informed the licensee that due to the lack of acceptable environmental J
qualification tests to substantiate the licensee's position, there was no assurance that the five items listed above would have properly functioned in postulated accidents. The staff has expressed particular concern with the instrument circuits landed on terminal blocks. Leakage current in these circuits due to moisture sad spray may affect the function of RPS and ECCS system actuation required to mitigate the consequence of an accident.
The evaluation and disposition of the apparent violation will be documented in subsequent communications.
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f CLINTON ENFORCEMENT ~C0lFERENCE
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ENVIRONEITAL QUALIFICATION DEFICIENCIES
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. INTRODUCTORY. REMARKS H. J. MILLER b
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TE0iNICAL ISSUE R. N. GARDNER L-
. LICENSEE RESPONSE ILLINDIS POWER COMPANY'
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- CLOSING' C0lfENTS H. J.' MILLER l
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ENVIROWENTAL QUALIFICATION DEFICIENCIES 1l i
'CLINTON NUCLEAR POWER STATION s
ON APRIL'20-21,~1989, AN NRC INSECTION WAS PERFORMED TO VERIFY THE-
ADEQUACY OF TliE LICENSEE'S CORRECTIVE ACTION IN REGARD TO THE SUBERGENE-0F ELECTRICAL CIRCUITS IN ELECTRICAL ENCLOSURES..DURING. AND SUBSEQUENT TO DilS INSECTION, A NlEBER OF 10 CFR 50.49 DEFICIENCIES WERE. IDENTIFIED-BY THE NRC AND THE LICENSEE.
A.
' HYDROGEN IGNITERS-THE LICENSEE IDENTIFIED HlAT THE FIELD CONNECTIONS FOR NUE ROUS HYDROGEN IGNITERS UTILIZED OKONITE TAPED SPLIES. TliESE TAPED-SPLICES WERE (A) NOT COMPATIBLE WITH THE TEFLON LEADS OF THE IGNITER, AND (B) BY DESIGN WERE REQUIRED TO BE RAYCHEM SPLICES.
B.
GE INSTRUENT RACKS l
NUER0VS GE INSTRUMENT RACKS, LOCATED INSIDE THE CORIAIWENT AND SUBJECT TO PRESSURE, STEAM, AND CONTAINMENT SPRAY, WERE FOUND TO
C0KfAIN SAFE SHlffDOWN INSTRUENT CIRCUITS (NSSS, RPS) LANDED ON
l TERMINAL BLOCKS. THESE BOXES HAVE TOP ENTRY CONDUITS AND ARE SUBJECT TO POSTULATED SUBMERGENE. THE BOXES HAVE WEEP HOLES, HOWEVER, BASED ON EQ DOClNENTATION, DIE TERMINAL BLOCKS HAD NOT BEEN SUCCESSFULLY TEsitD TO JUSTIFY LEAKAGE CURRENT FOR THE REQUIRED
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4-20 MA INSTRUMENT CIRCUIT APPLICATIONS.
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f*k 4-APPARENT VIOLATION 10 CFR 50.49, PARAGRAPHS (F) AND-(G) REQUIRE EQUIPMENT IIPORTANT TO
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SAFETY TO BE QUALIFIED BY TESTING AND/0R ANALYSIS PRIOR TO THE EQ DEADLINE 0F NOVEMBER 30,1985.
CONTRARY TO THE AB0VE, AS OF' APRIL 20, 1989, THE FOLLOWING 10 CFR 50.49 DESIGNATED E0VIPtEiT WAS NOT ENVIRONMENTALLY. QUALIFIED BY TEST AND/0R ANALYSIS:
1.
HYDROGEN IGNITER FIELD CONNECTIONS;-
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INSTRUMENT CIRCUITS LANDED ON TERMINAL BLOCKS IN GE INSTRlNENT RACKS; 3.
LIMIT SWITCHES ON DAMPER ASSEMBLY; AND l
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ELECTRICAL PENETRATION ENCLOSURES WITH TOP ENTRY CABLE PENETRATIONS l
OR WARPED WITH BOTTOM ENTRY CABLE PENETRATIONS.
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BWIRONMENTAL QUALIFICATION
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DEFICIENCIES l
C.
SOLEN 0IDVALVELEA4
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THE LICENSEE IDBRIFIED THAT CANNON PLUG CONNECTORS, UTILIZED ON THE TERMINATIONS OF SOLEN 0ID OPERATED AIR PILOT VALVES FOR THE MAIN STEAM SAFETY RELIEF VALVES, WERE NOT COVERED WITH RAYCHEM HEAT SHRINK
TUBING AS INDICATED IN THE SRV BNIR0ffiEtHAL QUALIFICATION PACKAGE.
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D.
DAMPER ASSBiBLY I
THE LICENSEE IDENTIFIED THAT LIMIT SWITCHES ON THE ACTUATOR FOR A
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STANDBY GAS TREATENT DAMPER ASSEMBLY LOCATED IN A HARSH ENVIRONMENT i
WERE QUALIFIED FOR HIGH RADIATION ENVIRONMENTS BUT NOT FOR 100% RH.
E.
ELECTRICAL PB1ETRATION ENCLOSURES
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A NlliBER OF ELECTRICAL PENETRATION BiCLOSURES WERE FOUND INSTALLED WITH TOP BURY CABLE PENETRATIONS THAT ALLOW C0tEAltfBR SPRAY TO IMPINGE ON TERMINAL BLOCKS. THE TERMlHAL BLOCKS WERE NOT QUALIFIED j
FOR LEAKAGE CURREIR RESULTING FROM IMPINGING CONTAltt1ENT SPRAY.
IN ADDITION, TWO ENCLOSURES WITH BOTTOM ENTRY CABLE PB4ETRAT10NS WERE F0lJND TO BE SLIGHTLY WARPED, WHICH COULD ALLOW CONTAINMEIR SPRAY TO
IMPINGE ON THE TERMINAL BLOCKS.
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