ML20063K960
| ML20063K960 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 08/27/1982 |
| 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, GOE-82-718, NUDOCS 8209080564 | |
| Download: ML20063K960 (2) | |
Text
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- n. 51' 9
'.': 3 Washington Public Power Supply System,,,
P.O. Box 968 3000 GeorgeWashingtonWay Richland, Washington 99352 (509p?2-5000 August 27, 1982
'N G02-82-718 g.
Mr. R. H. Engelken 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
Reference:
Letter G02-82-0997, dated June 3, 1982, R.G. Matlock to R.H. Engelken In accordance with the provisions of 10CFR50.55(e), your office was informed by telephone of the above subject reportable condition on May 11, 1982. Attachment A provides the Project's interim report on Condition #190. We will continue to provide your office with quarterly updates on Condition #190 until resolved. The next report will be sub-mitted on or before November 24, 1982.
If there are any questions concerning this matter, please contact Roger Johnson, (509) 377-2501, extension 2712.
ch ft,A a
Program Director, WNP-2 LCF/jdb Attachments:
(1) As stated cc:
W.S. Chin, BPA - Site R.A. Feil, NRC Resident Inspector - Site A. Forrest, Burns and Roe - HAP 0 N.D. Lewis, NRC l
J. Plunkett, NUS Corp.
I R.E. Snaith, Burns and Roe - NY Document Control Desk, NRC Site Files 917B l
U209080564 820827
/ E"47 gDRADOCK 05000397 PDR i
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 AUGUST 19, 1982 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, limit-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 IE 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 volt-age drop in control circuit is reduced.
2.
Increase CPT size so that voltage drop due to transformer impedence 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 implement option 2 to increase the control power transformer (CPT) from a 300 VA CPT to either a 5000 VA CPT or l
a 1 KVA CPT. We are in the process of identifying a qualified Class IE CPT for this application. As soon as this is done a Project Engineer-ing Directive will be issued to effect the change.
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