ML17299A925
| ML17299A925 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 01/07/1986 |
| From: | Licitra E Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| TAC-56648, NUDOCS 8601160145 | |
| Download: ML17299A925 (12) | |
Text
~S Argy (4
Cp n
C O
I 10 C
Cy
+r+~
gO
++*++
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 4N 7 ]986 Docket No.:
50-528 LICENSEE:
Arizona Public Service Company FACILITY:
Palo Verde Unit 1
SUBJECT:
SUMMARY
OF MEETING CONCERNING 9/12/85 UNUSUAL EVENT DURING LOSS OF LOAD TEST A meeting was held in Bethesda, Maryland on September 20, 1985 with representatives of the licensee to discuss the Unusual Event that occurred on September 12, 1985 during a loss of load test at about 505 power.
The meeting attendees are shown on Enclosure 1.
The backqround for and summary of the meeting are presented below.
Backqround On September 12, 1985, following the start of a loss of load test from about the 50% power level, Palo Verde Unit 1 experienced an unusual event which resulted in a number of unexpected occurrences.
These included a turbine trip, a lack of fast transfer of power from the generator to offsite power for non-essential
- loads, reactor trip, safety injection actuation (SIAS),
containment isolation and gas binding of the three charqing pumps.
Since the charging system is also used to provide water to the pressurizer auxiliary spray system, the auxiliary spray system was not available to perform its function, if it was required.
The following two things contributed to the gas binding of the charging pumps:
(1) a single failure in the volume control tank (VCT) level indicator, and (2) upon receipt of gn SIAS, shedding of power, by design, to the motor control center (MCC) for two of the valves (CH-501 and CH-536) which control water availability to the charginq pumps from the VCT and refueling water tank (RWT), respectively.
Because of the above, the staff questioned the design basis for the auxiliary spray system.
As a result, on September 16, 1985 the licensee agreed not to restart the plant until the design basis issue was evaluated by the staff.
Region V issued a confirmatory action letter on September 17, 1985 documenting the licensee's commitment.
By [[letter::05000528/LER-1985-048, Corrected LER 85-048-00:on 850819,ECCS Subsystem RQ & Bp Declared Inoperable Due to Noncompliance W/Surveillance Requirement 4.5.2.g.1.Temporary Change Initiated to Permit Testing of ECCS Throttle Valves|letter dated September 18, 1985]], the licensee proposed interim compensatory measures in support of continued operation of plant while a reevaluation of the auxiliary spray system was being performed to determine whether the system needed to be upgraded.
The September 20, 1985 meeting was held to discuss the September 12, 1985 event and the proposed interim compensatory measures for restart.
860if60i45 860l07 PDR ADOCK 05000528 8
0 J
1'
Meetin Summar (9/20/85 At the meeting, the licensee provided a more detailed discussion of the sequence of events that occurred on September 12, 1985.
The licensee indicated that the event had complications and the additional people that were available when the next shift arrived were helpful in recovering from the event.
During this presentation, discussions were held on the post-trip review process, vendor reviews of tests and hydrogen venting'of the charging pumps.
The design of the auxiliary pressurizer spray system (APSS) was also discussed.
The licensee stated that APSS was considered safety grade only in the context of complying with RSB 5-1 for achieving cold shutdown.
The staff indicated that APSS should be fully safety grade since APSS is ~elied upon for mitigating a postulated steam generator tube rupture (SGTR) accident.
The licensee stated that it is performing a reanalysis of the SGTR accident without reliance on APSS.
The compensatory measures for restart of Palo Verde Unit I were then discussed.
In addition to measures proposed by the licensee in its [[letter::05000528/LER-1985-048, Corrected LER 85-048-00:on 850819,ECCS Subsystem RQ & Bp Declared Inoperable Due to Noncompliance W/Surveillance Requirement 4.5.2.g.1.Temporary Change Initiated to Permit Testing of ECCS Throttle Valves|September 18, 1985 letter]], the licensee committed to other measures identified by the staff.
A summary of all the compensatory measures the licensee committed tn is shown below.
(I)
Monitor the reference leg of the VCT level indicator on a daily basis.
(2)
Revise appropriate procedures to require alignment of the RWT to the charging pump suction upon loss of offsite power, and institute procedural cautions on restart of the charging pumps.
(3)
Examine the post-trip review process to assure'hat the potential safety significance of off-normal events is adequately evaluated.
(4)
For the remaining power ascension test, assure that appropriate vendor input has been provided and determine if additional staffing on shift may be appropriate.
The staff stated that with the above compensatory measures it would recommend to Region V that Palo Verde Unit I be permitted to restart.
The staff informed the licensee that the long-term measures for upgrading the reliability of APSS would be the subject of a 50.54(f) letter.
E. A. Licitra, Project Manaqer PWR Project Directorate No.
7 Division of PWR Licensina-B
Enclosure:
(1)
Meeting Attendees cc:
See next page
0 J
l
Mr. E.
E.
Van Brunt, Jr.
Arizona Nuclear Power Project Palo Verde CC:
Arthur C. Gehr, Esq.
Snell 5 Wilmer 3100 Valley Center Phoenix, Arizona 85073 Mr. James M. Flenner, Chief Counsel Arizona Corporation Commission 1200 West Washington Phoenix, Arizona '5007 Charles R. Kocher, Esq. Assistant Council James A. Boeletto, Esq.
Souther n California Edison Company P. 0.
Box 800
- Rosemead, California 91770 Mr. Mark Ginsberg Energy Director Office of Economic Planning and Development 1700 West Washington - 5th Floor Phoenix, Arizona 85007 Mr. Wayne Shirley Assistant Attorney General Bataan Memorial Building Santa Fe, New Mexico 87503 Mr. Roy Zimmerman U.S. Nuclear Regulatory Commission P. 0.
Box 239 Arlington, Arizona 85322 Ms. Patricia Lee Hourihan 6413 S. 26th Street Phoenix, Arizona 85040 Regional Administrator, Region V
U. S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, Cali fornia 94596 Kenneth Berlin, Esq.
Winston 8 Strawn Suite 500 2550 M Street, NW Washington, DC 20037 Ms. Lynne Bernabei Government Accountability Project of the Institute for Policy Studies 1901 gue Street, NW Washington, DC 20009 Ms. Jill Morrison 522 E. Colgate Tempi, Arizona 85238 Mr. Charles B. Brinkman, Manager Washington Nuclear Operations Combustion Engineering, Inc.
7910 Woodmont Avenue Suite 1310
- Bethesda, Maryland 20814 Mr. Ron Rayner P. 0.
Box 1509
- Goodyear, AZ 85338
ENCLOSURE ATTENDEES SEPTEMBER 20 1985 MEETING ON PALO VERDE UNIT 1 CONCERNING UNUSUAL EVENT DURING LOSS OF TEST LOAD NRC E. A. Licitra George Knighton.
Tom Novak Roy Zimmerman Sue Gagner David R. Powell Calvin M. Moon Marilyn Ley Karen Cyr Bob Stevens Chandu Patel Gary Holahan Om Chopra J. T. Beard L. B. Marsh Brian Sheron Chu Liang Arizona Re ublic John Staqgs Offawa News Service Dana Bottoff Doc-Search Associates L. Connor Nucleonics-Week Mary Louise Wagner APS Dick Gouge Dennis Swan "Jerry G.
Haynes Terry F. Juan Arthur C. Gehr Gerald Sowers Robert M. Butler Carter Rogers CE A. E. Scherer Vincent P. Krecicki George Davis Charles Brinkman Tim Collier Fred L. Carpentino Rick Turk Charles Ferguson Bechtel Wm. G. Bingham Steve Shepherd BSW Bob Borsum
MEETING
SUMMARY
DISTRIBUTION c:Docket No 5D-52D NRC PDR Local PDR PBD-7 Reading JPartlow GWKnighton BGrimes ACRS (10)
EJordan
- Attorney, OELD GWKnighton Project Manager E. A. Licitra NRC PARTICIPANTS E.
A. Licitra G.
W. Knighton T.
M. Novak R.
Zimmerman Sue Gagner David R. Powell Calvin M. Hoon Marilyn Ley Karen Cyr Bob Stevens Chandu Patel Gary Holahan Om Chopra J. T. Beard L. B. Marsh Brian Sheron Chu Liang bcc:
Applicant 5 Service List
wj tg kl il f
t k
t
Meetin Summary (9/20/85)
At the meeting, the licensee provided a more detailed discussion of the sequence of events that occurred on September 12, 1985.
The licensee indicated that the event had complications and the additional people that were available when the next shift arrived were helpful in recovering from the event.
During this presentation, discussions were held on the post-trip review process, vendor reviews of tests and hydrogen venting of the charging pumps.
The design of the auxiliary pressurizer spray system (APSS) was also discussed.
The licensee stated that APSS was considered safety grade only in the context of complying with RSB 5-1 for achieving cold shutdown.
The staff indicated that APSS should be fully safety grade since APSS is relied upon for mitigating a postulated steam generator tube rupture (SGTR) accident.
The licensee stated that it is performing a reanalysis of the SGTR accident without reliance on APSS.
The compensatory measures for restart of Palo Verde Unit 1 were then discussed.
In addition to measures proposed by the licensee in its [[letter::05000528/LER-1985-048, Corrected LER 85-048-00:on 850819,ECCS Subsystem RQ & Bp Declared Inoperable Due to Noncompliance W/Surveillance Requirement 4.5.2.g.1.Temporary Change Initiated to Permit Testing of ECCS Throttle Valves|September 18, 1985 letter]], the licensee committed to other measures identified by the staff.
A summary of all the compensatory measures the licensee committed to is shown below.
( 1)
Monitor the reference leg of the VCT level indicator on a daily basis.
(2)
Revise appropriate procedures to require alignment of the RWT to the charging pump suction upon loss of offsite power, and institute procedural cautions on restart of the charging pumps.
(3)
Examine the post-trip review process to assure that the potential safety significance of off-normal events is adequately evaluated.
(4)
For the remaining power ascension
- test, assure that appropriate vendor input has been provided and determine if additional staffing on shift may be appropriate.
The staff, stated that with the above compensatory measures it would recommend to Region V that Palo Verde Unit 1 be permitted to restart.
The staff informed the licensee that the long-term measures for upgrading the reliability of APSS would be the subject of a 50.54(f) letter.
Enclosure:
( 1)
Meeting Attendees cc:
See ext page PD7 g/j PD7 EALici"t a/es GWKn'ghton 1/$ /86 1/7 /86 Original sigt'~< bY:
S. k t.mitra E. A. Licitra, Project Manager PWR Project Directorate No.
7 Division of PWR Licensing-B
4 r'4 4
Nh t
4 4
4 t
~.
I -
h lt4 4
t f ~
I'4,1 I I t4
- f 4 jl 4
"" I ~ 4 f
~
f 4
~ /
t I
4 4
I
)
llv 4'j 4
t f 8
jh
~
NI f I 4
~
t' 't 4
~