ML20236X535
| ML20236X535 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 12/01/1987 |
| From: | Bournia A Office of Nuclear Reactor Regulation |
| To: | Andrews R OMAHA PUBLIC POWER DISTRICT |
| References | |
| TAC-54804, NUDOCS 8712090267 | |
| Download: ML20236X535 (3) | |
Text
W
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NUCLEAR REGULATORY COMMISSION n
O WASHINGTON, D. C. 20555
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g December 1,1987 I
Docket No. 285 Mr. R.
L.' Andrews Division manager - Nuclear Production Omaha Public Power District 1623 Harney Street Omaha, Nebraska 68102
Dear Mr. Andrews:
SUBJECT:
NRC OPEN ITEMS AS A RESULT INSERVICE TESTING PROGRAM MEETING -
FORT.CALHOUN STATION, UNIT 1 (TAC 54804)
As a result of meetings held with you on October 14 and 15,1987 on your inser-vice testing (IST) program at the Fort Calhoun Station, minutes of the meetings were sent to you dated November 16, 1987.
As was indicated by the minutes of the meeting, these discussions resulted in three open items for the NRC to address and fourteen open items for you to address.
The following addresses the NRC three open items and our position on them.
The numbers are delineated according to the minutes of the meeting.
Section No.
G 7
You stated that no credit is taken for the operability of the charging pumps in any accident scenario.
However, yor achnical Specification Section 2.2(2) defines the operability of at least two charging pumps as a condition necessary to assure safe reactor operation.
- Moreover, Section 6.2 of the USAR states that "SIAS aligns the charging pumps in the chemical and volume control system to take suction from the concentrated boric acid storage tanks".
A similar statement on the actuation of these pumps following a SIAS is made in USAR Section 9.2.3.7.
It appears that the charging pumps have a safety related function and, therefore, the charging pumps and the valves in the applicable flow paths should be included in the IST program and tested to the Code requirements to the extent practi, cal.
H 11 With regard to valves SI-175 and SI-176, you stated that the contain-ment spray system is redundant to the containment air filtration and cooling system and, therefore, need not be exercised.
A staff review of USAR Section 6.4.5, however, indicates that both the sprays and the containment coolers are needed for sufficient containment cooling capacity in the event of a design basis accident involving LOSP and failure of one emergency diesel.
Accordingly, the staff's position is that these valves should be exercised.
I P
8712090267 871201 PDR ADOCK 05000285 P
PDR 1
l
t L 1
The NRC position is that the pressurizer power operated relief valves I
(PORVs) should be included in the IST program as Category B valves and tested to the requirements of Section XI.
However, since the i
PORVs have shown a high probability of sticking open and are not needed for overpressure protection during power operation, the NRC i
has concluded that the IWV-3410 provisions for exercising quarterly during power operation is "not practical" and, therefore, not required by 10 CFR 50.55a(g).
The PORVs' function during reactor startup and shutdown is to protect the reactor vessel and coolant system from low-temperature over-pressurization conditions and should be exercised prior to initiation of system conditions for which vessel protection is needed.
Exercising of the PORVs should be performed after the operability of the block valves is assured by exercising and stroke timing.
The following test schadule is required:
a.
Full-stroke exercising should be performed at each cold shutdown or, as a minimum, once each refueling cycle.
b.
Stroke timing should be performed at each cold shutdown, or as a minimum, ence each refueling cycle.
c.
Fail-rafe actuation testing should be performed at each cold shutdown.
d.
The PORV block valves should be included in the IST program and tested quarterly to provide protection against a small break LOCA should a PORV fail open.
e.
In case of frequent cold shutdowns, testing of the PORVs is not required more often then cach three months.
The above clarifications should be included in your Fort Calhoun Station IST resubmittal.
If you have any questions regarding this matter please contact me at (301) 492-7591. The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.
Sincerely, IJI Anthony Bournia, Project Manager Division of Reactor Projects - III IV, V and Special Projects Office of Nuclear Reactor Regulation cc:
See next page DIdRIBUTION Ti65etFile PD4 Reading P. Noonan E. Jordan NRC PDR DR4A/Co11 ins Project Manager J. Partlow Local PDR J. Calvo 0GC-Bethesda ARCS (10)
PD4 Plant File K. Dempsey m
PD4/LQb PD4/PM PD4/D g;L PNoonhd ABournia JCalvo lQ/\\ /87
\\V/l/87 (1///87
Mr. R. L. Andrews Fort Calhoun Station l
Omaha Public Power District Unit No. 1 CC*
Harry H. Voigt, Esq.
l LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, NW Washington, D.C.
20036 Mr. Jack Jensen, Chairman Washington County Board of Supervisors Blair, Nebraska 68008 Mr. Phillip Harrell, Resident Inspector U.S. Nuclear Regulatory Commission P. O. Box 309 Fort Calhoun, Nebraska 68023 Mr. Charles B. Brinkman, Manager Washington Nuclear Operations C-E Power Systems 7910 Woodmont Avenue Bethesda, Maryland 20814 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Office of Executive Director for Operations 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Harold Borchert, Director Division of Radiological Health Department of Health 301 Centennial Mall, South P.O. Box 95007 Lincoln, Nebraska 68509 W. G. Gates, Manager Fort Calhoun Station P. O. Box 399 Fort Calhoun, Nebraska 68023 l
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