ML20247Q924

Part 21 Rept 89-01 Re Containment Electrical Penetration Assemblies Supplied by Bunker Ramo.Design or Mfg Const Deficiencies Could Have Created Substantial Safety Hazards. Integrity Checks Conducted to Identify Inadequate Crimps

ML20247Q924
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	05/26/1989
From:	Cockfield D PORTLAND GENERAL ELECTRIC CO.
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
REF-PT21-89, REF-PT21-89-082-000 89-01, 89-1, PT21-89-082-000, PT21-89-82, NUDOCS 8906070082
Download: ML20247Q924 (3)

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aus r - E PbrtlandGeneralElectricCeny syy David W. Cockf> eld Vice President, Nuclear May 26, 1989 Trojan Nuclear Plant Docket 50-344 License NPF-1 Mr. John B. Martin Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek CA 94596-5368

Dear Sir:

TROJAN NUCLEAR PLANT 10 CFR 21 Defect Report Containment Electrical Penetration Assemblies (EPAs)

The attached report is submitted in accordance with Title 10 of.the Code of Federal Regulations, Part 21 (10 CFR 21). A defect has been identified in I

the integrity of wire crimp terminations in individual Containment EPA modules of the soft seal epoxy design. The supplier of the EPAs, Bunker Ramo Corporation, is no longer in business.

Please contact us with any questions or comments regarding this defect.

Sincerely, j

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gg . c: U.S. Nuclear Regulatory Commission [] j ggrt ATTN: Document Control Desk l Washington DC 20555 - l oo wy, C00 co ;u i Mr. William T. Dixon c3 , i coo State of Oregon 88 Department of Energy h j.

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4 Mr. R. C. Barr ,

k$ NRC Resident Inspector 2 {

OfLLO Trojan Nuclear Plant / i

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4 121 S W Sanon Street Pomana Ore;pn 97204

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, trajen Nuclear PIEnt Document Control De:k s Docket 50-344 Attachment License NPF-1 May 26, 1989 Page 1 of 2 j 10 CFR 21 DEFECT REPORT l,

Portland General Electric Company Report No. : 89-01 121 SW Salmon Street Report Date: May 26, 1989 Portland Oregon 97204 l

TROJAN NUCLEAR PLANT Responsible Officer:

Mr. D. w. Cockfield, Vice President Nuclear Date Responsible Officer Received Information:

May 25, 1989 l Basic Component or Activity: i Electrical Penetration Assembly (EPA)

Manufacturer's Number: 50003326 i PGE Purchase Order: N-00318 Defective Component: Module (Soft Seal Epoxy Design)

Type: Low Voltage ait Instrumentation l 6-Firm Supplying Basic Component: (No longer in business)

Bunker Ramo Corporation i Amphenol Space and Missile Systems (SAMS) Division l 9201 Independence Avenue Chatsworth, California 91311 i

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.i Description of Defect and Substantial Safety Hazard That Could Be Caused: j On April 28, 1989 during EPA module maintenance, seven wire crimp l terminations within an EPA module failed to remain intact under a tensile  !

load estimated at five to ten pounds-force. In subsequent testing, )

inadequate crimp terminations have been identified in those modules )

I associated with wire sizes #14 and #16 American wire gauge (AWG).

1. 14 AWG wire is used to provide control and indication power for many )

safety-related valves. #16 AWG wire is used to provide signal j information for process instrumentation. If the wires were detached from the module conductors during a seismic event, the capability to prevent ,

or mitigate the consequences of an accident would be seriously degraded.

It is concluded that this design or manufacturer's construction  !

deficiency could have created a substantial safety hazard. l I

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,. Krojan Nuclesr Pirnt Docum:nt Control Dsak 1 Docket 50-344 Attachment License NPF-1 May 26, 1989 l Page 2 of 2 l

Number and Location of Such Components in Use at the Trojan Nuclear Plant:

Nine safety-related or accident monitoring-related EPAs with crimp termi-nations of similar design are installed in the Containment Building wall of the Trojan Nuclear Plant. Four of these contain modules with #14 AWG wires. The remaining five contain modules with #16 AWG wires.

Corrective Acticn:

Integrity checks are being conducted by Portland General Electric Company (PCE) to identify inadequate crimp terminations affecting safety-related or accident monitoring-related equipment. The integrity check is a pass / fail test of the terminations with a specified tensile load applied.

Circuits associated with terminations that fail the integrity check are being rewired through terminations which have passed the check. Design drawings are being updated to reflect wiring changes. Testing, repairs, evaluation of associated potential concerns and operability verification of safety-rele.ted or accident monitoring-related EPA modules will be completed prior to startup from the current refueling outage.

One module experienced a large number of termination failures during the integrity check. This module will be replaced and destructively examined to determine the root cause of the failures. The completion date of this action has not been determined. .

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Other Pertinent Information:

Loose crimp termination problems in EPAs supplied by the Bunker Ramo ,

Corporation were previously reported to the Nuclear Regulatory Commission ]'

(NRC) as outlined in NRC Bulletin (NRCB) 82-04, " Deficiencies in Primary Containment Electrical Penetration Assemblies;" however, the actions to be taken by holders of operating licenses were directed to plants having EPAs utilizing a hard seal epoxy module design. Trojan Plant EPAs utilize a soft seal epoxy module design. l l

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