ML19327B968
| ML19327B968 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, Zion, 05000000 |
| Issue date: | 11/01/1989 |
| From: | Chrzanowski R COMMONWEALTH EDISON CO. |
| To: | Murley T Office of Nuclear Reactor Regulation |
| References | |
| 0360T:1, 360T:1, GL-88-17, NUDOCS 8911140280 | |
| Download: ML19327B968 (2) | |
Text
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}' Commonwealth Edison y
n west Adams Street, Ctucapo, liknois 9
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KdSissTREWiiEWiOff.5e B6D6'f' t
,s N_
Crucap;, likros 60690 0767 November 1, 1989 l
r Dr. Thomas E. Murley, Director l
l Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commtssion i
Washington, DC 20555
[
Subject:
Byron Station Units 1 and 2 Braidwood Station Units 1 and 2 i
.1 Zion Station Units I and 2 Generic Letter 88-17 Supplemental Information i
Loss of Decay Heat Removal MRC Docket Nos. 50-454/455. 50-456/457. and 50-295/304
References:
(a) September 15, 1989, letter from R. A. Chrzanowskt to T. E. Hurley
Dear Dr. Murley:
j Commonwealth Edison provided the status of the Generic Letter 88-17, f
Loss of Decay Heat Removal, implementation for Dyron, Braidwood, and Zion Stations in reference (a).
This letter provides an update on the Residual Heat Removal system icotic display.
i Zion Station has a main control board annunciator titled "RHR Pump Suction Pressure Lo".
The purpose of this alarm is to alert the operators of impending Residual Heat Removal pump cavitation prior to air entrainment.
The specific annunciator response procedure is contained in Attachment A.
With the use of this alarm and the other system Indications, Commonwealth Edison believes that the requirements of the Generic Letter regarding RHR monitoring at Zion Station is satisfied.
Therefore, the iconic display will not be implemented at Zion Station.
Byron and Braidwood Stations are continuing to review the implementation of the iconic display. A decision will be forthcoming by January 30', 1990.
Please direct any further questions regarding this matter to this office.
I Very truly yours,
,n 47 4*N
$8 R. A.
rzanowski i
O,84 Nuclear Lic sing Adirinistrator
-o
$8 Attachment i
OU cc:
Byron Resident Inspector
$O Braidwood Resident Inspector I {i SG Zion Resident Inspector
)
0 L. N. 01shan - NRR E.$
S. P. Sands - NRR ld GM C. Patel - NRR
\\\\
l Region III Office Office of Nuclear Facility Safety - IDNS 0360T:1
ATTACWERT A ANNUNCIATOR LOCATION 11 UNIT 2 RMR PUMP 5 setpoints 11.5 psig
$UCTION Origin:
RHR low suction pressure switches 2P5L401 or 2PSL-602 j
PRES $URE LO l
l (Multiple Input - No Reflash) l
........ ***enene.........**e.********e.e****e.........
l CAUTION e
l
- This Annunciator is valid MLY when the plant is in
- cold shutdown with RCS pressure less than or equal j
- to 100 psig.
eneene...... **eneeeee*******ene**ene.*ene****************
Probable Cause:
1.
Reactor vessel level too low 2.
RHR suction valves 2MOV-RH8700A, 2MOV-RH8700s, 2MOV-RH8701 or 2MOV-RH8702 have closed, j
Automatic Action:
None t
innediate Action:
1.
E due to loss of reactor vessel level I!Q refer to ADP-6.3 as appropriate.
[
i 2.
E due to closure of suction valves 2MOV-RH8701 i
and 2M0V-RH8702, T attempt to open the valve i
MA refer to AOP..
j 3.
Check reactor vessel level.
4.
Check RHR purep amps.
l 5.
Verify RHR pump is not out of service for maintenance.
o t
Supplementary Action:
l l
1.
Monitor reactor vessel level until alam is i
cleared.
i 2.
E the pump is isolated for maintenance igg turn l
alarm of f at junction box 2H560) or 2HS-602 on j
the Aux 81dg elevation 542'.
Take switch 0.0.5.
per the work request.
t i
Inoper6ble Annunciator Action:
No additional surveillance required.
References:
1.
M-520 2,
22C-2-4840 page RH16 and 22C-2-4643 i
0044[evisionDate: JUN 181988 0013A l
9 I
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