GO2-82-944, Interim Deficiency Rept Re Voltage Drop Due to Excessive Cable Length.Initially Reported on 820603.Control Power Transformer Output Increased.Voltage No Longer Impeded & Long Cable Used.Next Rept Expected by 830222

Interim Deficiency Rept Re Voltage Drop Due to Excessive Cable Length.Initially Reported on 820603.Control Power Transformer Output Increased.Voltage No Longer Impeded & Long Cable Used.Next Rept Expected by 830222

ML20067B400
Person / Time
Site:	Columbia
Issue date:	11/23/1982
From:	Matlock R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, G2-82-944, GO2-82-944, NUDOCS 8212060179
Download: ML20067B400 (2)

Text

Docket No. 50-397

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50.55(e) Report yflTO Washington Public Power SuppigSystem P.O. Box 968 3000GeorgeWashingtonWay Richland,Washingo6g3,5 (509)372-5000 Docket No. 50-397 12' Jg November 23, 1982 'D/0//tq;6 G02-82-944 Mr. R. H. Engelken Regional Administrator U.S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596

Subject:

NUCLEAR PROJECT NO. 2 10CFR50.55(e) REPORTABLE CONDITION #190 EXCESSIVE CABLE LENGTH

References:

1. Letter G02-82-0997, dated June 3, 1982, R. G. Matlock to R. H. Engelken, same subject.

2. Letter G02-82-718, dated August 27, 1982, R. G. Matlock to R. H. Engelken, same subject.

In accordance with the provisions of 10CFR50.55(e), your office was informed by telephone, of the subject reportable condition on May 11, 1982. References 1 and 2 above were interim reports on the same subject.

All actions relative to this condition have yet to be completed, there-fore, we are submiting this as an interim report. Attachment A to this letter is an updated copy of the attachment to our last interim report.

We will continue to provide your office with quarterly updates on the subject condition until it is resolved. The next report will be sub-mitted on or before February 22, 1981 If there are any questions concerning this matter, please contact Roger Johnson, WNP-2 Project QA Manager, at (509) 377-2501, extension 2712.

. a o'cf f Program Director, gg WNP-2 MER/kd cc: W.S. Chin, BPA - Site o A. Forrest, Burns and Roe - HAPO L N.D. Lewis, NRC J. Plunkett, NUS Corp.

30 48 R.E. Snaith, Burns and Roe - NY '

@4 A. Toth, NRC Resident Inspector - WNP-2 gg Document Control Desk, NRC ,

coa.us WNP-2 Files (9178)

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ATTACHMENT A WASHINGTON PUBLIC POWER SUPPLY SYSTEM NUCLEAR PROJECT NO. 2 DOCKET NO. 50-397 LICENSE NO. CPPR-93 EXCESSIVE VOLTAGE DROP DUE TO EXCESSIVE CABLE LENGTH 10CFR50.55(e) CONDITION #190 INTERIM REPORT DESCRIPTION OF DEFECT OR NONCOMPLIANCE It was discovered that some of the circuits using size four (4) starters have excessive control cable length in control circuits, thereby, liiait-ing the voltage available at starter terminals. Such voltage may be less than that required to pick up the starter coil.

SAFETY IMPLICATION HPCS-P-2 is required to attain safe shutdown of the plant under certain accident conditions. If it were to be unavailable, it would negate some of the accident analysis in the FSAR.

APPROACH TO RESOLUTION All Class lE control circuits were investigated. It was discovered that the control circuit wire length for HPCS-P-2 was too long to pick up the starter coil if MCC voltage was less than 90% of rated voltage.

CURRENT STATUS To resolve the problem for HPCS-P-2, the following alternatives were investigated:

1. Use control cable with #10 wire size (instead of #12) so that vol-tage drop in control circuit is reduced.

2. Increase CPT size so that voltage drop due to transformer impecence is low and longer control cable length can be used.

3. Use interposing relay in control circuit so as to reduce the CPT burden.

The Project has determined to implenent option 2 to increase the control power transformer (CPT) from a 300 VA CPT to either a 500 VA CPT or a 1 Ki'A CPT. We are in the process of identifying a qualified Class lE CPT for this application. Project Engineering is preparing PED 218-E-A320 to effect the required changes, the work associated with this PED has yet to be performed because the Project is waiting for the equipment to arrive on site.

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