ML19259D266
| ML19259D266 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 10/01/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Koester G KANSAS GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7910170526 | |
| Download: ML19259D266 (1) | |
Text
7IC UNITED STATES
- b /ea ancgo NUCLEAR REGULATORY COMMISSION t
REGloN IV O'{
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o 611 RYAN PLAZA DRIVE. SUITE 1000 5
ARLINGTON, TEXAS 76012
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October 1, 1979 In Reply Refer To:
RIV Docket No. STN 50-482/IE Information Notice No. 79-25 Kansas Gas & Electric Co.
Attn:
Mr. Glenn L. Koester V'ce President-Operations Post Office Box 208 Wichita, Kansas 67201 Gentlemen:
This IE Information Notice is provided as an early notification of a possibly significant matter.
It is expected that recipients will review the information for possible applicability to their facilities.
No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular, Bulletin, or NRR Generic Letter will be issued to recommend or request specific licensee actions.
If you have questions regarding the matter, please contacc the Director of the appropriate NRC Regional Office.
Sincerely,
,7 l
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Karl V. Scyfrit Y Director
Enclosures:
1.
IE Information Notice No. 79-25 2.
List of IE Information Notices Issued in Last Six 'fonths cc:
w/ enclosures Messrs.
Nicholas A. Petrick, SNUPPS D. T. McPhee, Kansas City Power and Light Company Gerald Charnoff, Shaw, Pittman, Potts & Trowbridge E. W. Creel, Kansas Gas and Electric Company f f h,,)
}ff I910170
Accession No.:
7908220125 SSINS No.:
6870 UNITED STATES NUCLEAR REGULATORY CO.TIISSION OFFICE OF INSPECTION AND ENFORCEllENT WASHINGTON, D. C.
20555 IE Information Notice 79-25 Date: October 1, 1979 Page 1 of 2 REACTOR TRIPS AT TURKEY POINT UNITS 3 AND 4
Background
On August 3, Turkey Point Units 3 and 4 tripped operating at full power.
A voltage spike on a second protection channel caused Unit 4 to trip during surveillance testing oa the reactor protection system.
This resulted in a loss of offsite power and subsequent shedding on non-essential loads.
Unit 3 tripped as the result of high coolant pr'.ssure caused by a turbine runback.
Discussion While performing a periodic test on channel "C" of the T-Average and Delta T Protection Channels, a spurious signal on channel "A" ccmpleted a 2 out of 3 trip logic: tripping Unit 4.
This resulted in a loss of offsite power condi-tion for Unit 4.
At this time, Unit 4 start-up tranforner was out of service due to performance of periodic maintenance. This condition caused the initiation of the emergency diesel generator load sequencer which resulted in the shedding of non-vital loads.
Among the non-vital loads shed, were those on Motor Control Cente:. (MCC) "D" which is common to both units.
Since the Rod Position Indication System for both units is powered by the non-vital portion cf MCC-D, a turbine runback on Unit 3 was initiated upon loss of rod position indication. This resulted ir. a reactor trip on high pressurizer pressure.
At the time, neither of the two pressurizer spray valves was available.
One was considered inoperable prior to the transient and the other, teepararily powered by the non-vital portion of !!CCD, had become unavailable earlier as a consequence of the Unit 4 trip.
A cubsequent review disclosed inadequacies the ad.ainistrative controls over the correction of operational problems ei
.ted by spray valve PCV-3-4553.
The original Hagan cont roller for sp"" ""
N'"
' "to ' '
and was placed by another manual coi control circuit and which had been control room.
The actual installat performed under estab_ oaed guidelis DUPLICATE DOCUMENT had been issued to ensure consistent operational control of this unusual Entire doctrnent previousl'f entered into system under:
MNN I162 265
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