ML20213D509
| ML20213D509 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 11/07/1986 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Martin R NRC OFFICE OF ADMINISTRATION (ADM), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-86-003, IEB-86-3, KMLNRC-86-209, NUDOCS 8611120127 | |
| Download: ML20213D509 (4) | |
Text
KANSAS GAS AND ELECTRIC COMPANY THE ELECTAC COMPANY OLENN L MOESTER WCE PoEs DEnf - NucLaam Nov mber 7, 1986 Mr. R. D. Martin, Regional Adninistrator U.S. Nuclear Regulatory Comnission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76011 U.S. Nuclear Regulatory Comnission Document Control Desk Washington, D.C. 20555 KMLNRC 86-209 Re:
Docket No. STN 50-482 Subj: Response to IE Compliance Bulletin 86-03 ne purpose of this letter is to provide a response for Wolf Creek Generating Station (WCGS), Unit No.
1 to IE Cmpliance Bulletin 86-03.
Bulletin 86-03 requires that a determination be made as to whether or not single-failure vulnerability exists in the minimum flow recirculation lines of any Emergency Core Cooling Systs (EOCS) pumps that could cause a failure of more than one EOCS train at NOGS.
W e Bulletin also requires a written report to the NRC which identifies whether or not this problem exists at WOGS.
In response to Bulletin 86-03, the design configuration for the EOCS pumps (centrifugal charging, safety injection, and residual heat removal) and their associated recirculation paths was reviewed to determine if this problem exists at WCGS.
%e results of this review concluded that the NOGS design configuration of the EOCS pumps and their recirculation paths is not vulnerable to a single failure in the minimum flow recirculation line of any EOCS pu::ps that could cause a failure of more than one EOCS train.
S e following considerations support this conclusion.
8611120127 861107 PDR ADOCK 05000482 PDR G
f6Ig 20t N. uarket - wcuta xansas - uan Address: po. Box 208 I wctuta, Kansas 6720s - Telephone: Area Code (3 t6) 261-6451
Mr. R. D. Martin November 7,1986 RMI.NRC 86-209 Page 2 centrifuaal maralna p===
s
'nso centrifugal charging peps are provided at WOGS.
In the event of an accident, the centrifugal charging pups are started automatically on receipt of a Safety Injection Signal (SIS) and are automatically aligned to take suction from the Refueling Water Storage Tank (RNST) during the injection phase.
These high head peps deliver flow through the Boron Injection Tank (BIT) to the Reactor Coolant System (RCS).
After the RNST has been exp e ded, suction is provided from the contairunent sung via the Redsidual Heat Removal (RHR) punps.
A separate minimizn flow bypass line is provided on end pmp discharge to recirculate flow to the punp suction after cooling, via the reactor coolant pm p seal water heat exchanger, during normal plant operation.
Ead mininun flow bypass line contains a normally locked-open, manual valve and a normally
- open, fail-es-is, motor-operated valve.
h motor-operated valves are powered by Class IE sources and close on receipt of SIS since the centrifugal charging pups are capable of delivering water to any expected RG pressure.
'this signal also closes the motor-operated valves to isolate the normal charging line and voltzne control tank and opens the charging pup /RNST suction valves to align the high head portion of the E03 for the injection mode.
Rafety Injecth P=m=
'nvo safety injection pumps are provided at WOGS.
In the event of an
- accident, the safety injection peps are started automatically on receipt of a SI3; take suction from the RM7T via normally open, motor-operated valves and deliver water to the RCS during the injection phase.
After the RHST has been expended, the safety injection pungs take suction from the containment smp via the RHR pWP8.
A minimum flow bypass line is provided for each pm p to recirculate flow to the RHST in the event that the pups are started with the RCS pressure above punp shutoff head.
This line also permits punp testing during normal plant operation. h minimmt flow bypass lines which are provided on each pm p discharge contain parallel, normally open, fail-as-is, motor-operated valves m W-8814A and m W-8814B in series with coninon, normally open, fail-as-is, motor-operated valve BN W-8813.
'these motor-operated valves are powered by Class IE sources and are manually closed from the control room as part of the ECCS realignment when switching from the RHar to the containment sung.
'the WOGS Technical Specifications require that the position of valve BN W-8813 be periodically verified, and also, confirm that the power to the valve operator has been removed.
. ~.
Mr. R. D. Martin Novesber 7,1986 IU D BC 86-209 Page 3 Emaidual Heat Bemoval Pumps s
Ttso residual heat removal paarps are provided at WOGS.
In the event of a Ioss of Coolant Accident (IOCA),
the RRR pungs are started automatically on the receipt of a SIS.
The RRR plays take suction from the RNST during the injection phase and from the contairunent simp after the RNST has been expended.
l 4
A minintmi flow bypass line is provided for each ptmp to recirculate and return the ptmp discharge fluid to the ptmp suction should the RRR ptmps be started with the RCS pressure above their shutoff head. This line prevents dea @aaMng of the plays and also permits pump testing during normal operation.
The mininnan flow bypass lines provided on each ptmp discharge contain normally open, fail-es-is, motor-operated valves FJ-PCV610 and EJ-PCV611.
These motor-operated valves are powered by Class IE sources and automatically close when the RRR plup discharge flow is greater than the ptmp minimum flow requirements.
The above described pump and valve configurations ensure that the EOCS i
ptmps minisum flow bypass lines at WOGs are adequately designed to sustain a single failure and still deliver the required flow through at least one train of ECCS pumps.
Therefore, the concerns identified in IE Coupliance Bulletin 86-03 are not applicable to NOGS and no further action is required in response to this Bulletin.
If you have any questions concerning this matter, please contact me or Mr. Otto Maynard of my staff.
Yours very truly, k
QA.
Glenn L. Koester Vice President - Nuclear GLK:wbb l
oc: PO'Connor (2)
JCununins I
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a STATE OF KANSAS )) ss CITY OF WICHITA )
I, John A.
Bailey, of lawful age, being first duly sworn upon oath, do depose, state and affirm that I am Director Engineering and Technical Services of Kansas Gas and Electric Company, Wichita, Kansas, that I have signed the foregoing letter of transmittal for Glenn L.
- Koester, Vice President Nuclear of Kansas Gas and Electric Company, know the content thereof; and that all statements contained therein are true.
b By John A. Bailey /
Director Engineering and Tbchnical Services SUBSCRIBED and sworn to before me this 7 day of
, 1986.
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