ML20098F036
| ML20098F036 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/17/1984 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| ANPP-30531-TDS, DER-84-62, NUDOCS 8410020246 | |
| Download: ML20098F036 (3) | |
Text
,.
+
Arizona Public Service Company.
]
.1 September 17, 1984-ANPP-30531-TDS/TRE
~
U.'. S. Nuclear Regulatory Commission Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek; California. 94596-5368 Attention: Mr. T. W. Bishbp; - Director
-Division of Resident Reactor Projects and Engineering Programs
Subject:
Interim Report - DER 84-62 A 50.55(e) Potentially Reportable Deficiency Relating To Load Sequencer-Did Not Function Properly During Safeguards. Testing.
File: 84-019-026; D.4.33.2
Reference:
Telephone Conversation between P. Narbut and T. Bradish on August 17; 1984 t
Dear Sir:
The NRC was notified of a potentially reportable. deficiency in the referenced telephone conversation. At that time, it was estimated that a determination of reportability would be made within thirty (30) days'.
Due to the extensive investigation and evaluation required; an Interim Report is attached. It is now expected that this information will be finalized by October 12, 1984; at which time a complete report will be submitted.
Very truly yours, Om E. E. Van Brunt, Jr.
APS Vice President Nuclear Production ANPP Project Director EEVB/TRE/nj NOO Attachment cc: See Page Two 39 a gi OZ (n.,3~3 5
a 03AGCTJ '
1
.. 10020246 840917 I L
-fDRADOCK 05000528 L
1E-17 9
v i
,4 T 4 Mr. T. W. Bishop DER 84-62 Page.Two ec:
Richard DeYoung,' D'irector Office of Inspection and Enforcement U. 'S. Nuclear Regulatory. Commission Washington, D. C.
20555 T. G. Woods, Jr.
D. B. Karner W. E. Ide D. B. Fasnacht A. C. Rogers L.' A. Souza D. E. Fowler T. D. Shriver
- C. N. Russo J. Vorees J. R. Bynum J. M. Allen J. A. Brand A. C. Gehr.
W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher H. D. Foster D. R. Hawkinson L. E. Vorderbrueggen R. P. Zimmerman S. R. Frost L. Clyde M. Woods T.. J. Bloom Records Center Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, GA 30339
[ f. - l.
INTERIM REPORT.- DER 84-62 POTENTIAL REPORTABLE DEFICIENCY ARIZONA ~ PUBLIC SERVICE COMPANY-(APS)
PVNGS UNIT 1
=
.I.
. Potential Problem
~
When BOP ESFAS is in Mode 1 (SIAS and DG running), a subsequent Loss of Power (LOP) will cause.an immediate closure of the DG brkr. This in turn starts Mode 1 sequencing which
" sequences on". the HPSI and 480VLC in.5 seconds. 'Also,
-immediately af ter LOP,' -a one-second load shed -occurs which overlaps the~.5-second HPSI/480VLC closure.
Consequently, the respective HPSI/480LYC breakers ureceive open and close signal concurrently. This causes the anti pump circuit to lockout the breaker. - - Thus, HPSI and 480VLC do not come on line.
Also, when the 480VLCs were. sequenced to cl6se af ter they were tripped by the load shed, the breakers did not attempt to.
close. This problem was discovered in the analyses of the -
recorder graphs which were taken during the above test.
II.
Approach To and Status Of Proposed Res'olution Bechtel Engineering is currently studying; this problem to determine reportability and technical justification for-corrective action.
III.
Projected Completion of Corrective Action i
and Submittal of the Final Report The r.omplete evaluation and final report are forecast to be completed by October 12, 1984
!j' 5
1 4
2
,---,r v.m..-n,
,..,4s-
--,m p...,
,,-3m. w,
e
-w,
,a g
-ew..
-