ML20079M462
| ML20079M462 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 11/04/1991 |
| From: | Withers B WOLF CREEK NUCLEAR OPERATING CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-88-004, IEB-88-4, WM-91-0151, WM-91-151, NUDOCS 9111080233 | |
| Download: ML20079M462 (2) | |
Text
____ - _ _ _ _ _
k LFCREEK W@ NUCLEAR OPERATING C Bart D WitN rs November 4,1991 nese nt.no c.n,.,e r m uts one,,,
WM 91-0151 U. S. Nuclear Regulatory Commission 1
ATTN:
Document Control Desk Mail Station F1-137 Washington, D. C.
20$$5
Reference:
1)
Letter dated July 8, 1988 from B. D. Withers, WCNOC 1
to Document Control Desk, NRC
- 2) Letter dated September 29, 1988 from B. D. Withers,
?
WCNOC to Document Control Desk, NRC 3)
Letter dated February 23, 1990 from B.
D.-
Withers.
WCNOC to Document Control Desk, NRC
Subject:
Docket No. 50-482:
Additional Information Concerning Response to NRC Bulletin 88-04 Gentlemen of this letter is to provide additional information concerning The purpose Wolf Creek Nucleur Operating Corporation's (WCN00) response to NRC Bulletin 88-04,
" Potential Sefety Related Pump Loss'.
Reference 1 transmitted the results of the study performed at Wolf Creek Generating Station (WCG r. ) - for safety-related pumps except for-the pumps supplied by Ingers.oll-Rand.
Reference 2 tratesmit t ed the information--on the Ingersoll-Rand pumps.
3 provided corrections due to the information being intt'vertently Reference transposed.
In Reference 3.
WCNOC provided cerrections to minimum flow requirements for the Centrifugr.1 Charging Pumps (CCP).
- However, this transmittal overlooked an additional change to Item b. of Actions To Be Taken.
Item b, should read as follows:
Place a precaution in SYS-BG-120 and SYS-BG-201 to keep charging flow b.
above'175 gpm (which incluoes 60 gpm during recirculation) when a centrifugal charging pump is running.
In References 1-3, WCNOC had provided information indicating thtt a change--
to the low flow alarm via-the Total Plant Setpoint Document was necessary a meter i
for the CCPs.
In place of changing the low flow alarm setpoint, banding change was made adding a red arrow. at the CCP minimum flow requirement.
The bases for not changing the low: flow-alarm was the operational philosophy to run the Positive Displacement Pump (PDP) unless l
c) 9111060233 911104 PDR ADOCA 050DO48t t
O PDR i
. a. Dox 411/ Bunngton, KS 668% ! Phone: (316) 304 8831
.eu. -,
t.
I h An Emmi CWrwtunity Empoyer M FHC VET
)
m.
~..a..
I l
l i
WH 91-0151 Page 2 taken out of service for corrective actions.
The PDP normal charging flow is less than the CCP low flow cavitation limit.
Therefore, a change to decrease the low flow alarm would create a nuisance alarm when the PDP is in operation.
Plant conditions may require running pumps at a flow below that recommended for continuous operation.
For these cases, additional evaluation of the occurrence is performed in accordance with plant procedures and may result in changes to the low flow requirements.
Documentation of the evaluations are availabic for review at the VCGS site.
If you have any questions concerning this matter, pierse contact me or Mr.
T. E. Cribbe of my staff.
Very truly yours.
M Bart D. Withers President and Chief Executive Officer BDW/aem cc:
L.
L. Gundritm (NRC), w/a A. T. Howell (NRC), w/a R. D. Hartin (NRC), w/a W. D. Reckley (NRC), w/a l
l
--w-~