ML20052H438
| ML20052H438 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 05/17/1982 |
| From: | Wuller G ILLINOIS POWER CO. |
| To: | John Miller Office of Nuclear Reactor Regulation |
| References | |
| REF-SSINS-6820 IEB-80-06, IEB-80-6, IEB-80-6--6, L30-82(05-17)-6, L30-82(5-17)-6, U-0481, U-481, NUDOCS 8205210053 | |
| Download: ML20052H438 (3) | |
Text
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f3 ILLINDIS POWER COMPANY g95_3yy_s
. fp 500 SOUTH 27TH STREET, DECATUR, ILLINOIS 62525 May 17, 1982 Mr. James R. Miller, Chief Standardization & Special Projects Branch Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Miller:
Clinton Power Station Unit 1 Docket No. 50-461 Our December 1, 1981 (U-0355) letter to you summarized the results of our review of the NSSS ESF systems in re-sponse to IE Bulletin 80-06.
The review of_the BOP ESF systems has now been completed.
The attachment is an up-date of the earlier submittal to incorporate the results of the B0P review.
We now consider this SER outstanding issue #12 as closed.
Sincerely,
(?'
G. E. Wuller Supervisor - Licensing Nuclear Station Engineering GEW/lt cc:
J. H. Williams, NRC Clinton Project Manager H. H. Livermore, NRC Resident Inspector Illinois Dept. of Nuclear Safety 8
8205210053 8, _20517 i
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Illinois Power Company Clinton Power Station Unit 1 May l_7, 1982 SER Outstanding Issue #12
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Engineered safety feature reset controls (IE Bulletin 80-06)'
(7.3.3.7)
Issue:
Automatic reset of safety systems logic following the return.to normal of the initiating signal must be reviewed in accordance with IE Bulletin 80-06.
Rest x
A review of system schematic level drawings of Engineered Safeguard Feature (ESF). functions NSSS and BOP was performed to determine their compliance to IE bulletin 80-06.
1
[
The conclusions of this review are as follows:
1.
BWR's do not have an " emergency mode" per se.
For clarifi-s cation purposes an " emergency mode" is considered to be an abnormal plant condition in this review.
2.
No initiating logic will automatically reset upon the re-turn of the initiating signal-to normal.
A " seal" is pro-
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vided on all initiating logic;-[
3.
A manually operated system level. reset cannot occur unless
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the cause of the initiation has been cleared.
A deliberate o=
operator action i~s required td accomplish manual ~ system
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level reset.
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4.
Upon a deliberate operator initiated system level manual reset, each system status is as follows:
a.
HPCS All actuated equipments remain in(their abnormal condition (e.g., HPCS pump running, injection valve open), l\\ manual operator action at the component level is required to change state of the actuated-equipments.
a(1)HPCS Diesel Generator A system level reset of the ESF, actuation-signal-will not shut down the diesel generator.
A manual operator action is required to shut the engine off.
However a system level reset does restore all of the protective trips provided for diesel generator protec-tion (i.e., high jacket. water temp, low lube oil aress.
reverse power, loss of excitation,Lovercurrent) which are blocked during an abnormal condition.
If any of-these protective trips are present at the time of system level reset, the diesel generator.will trip,and a lockout will occur.
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4 Responae (cont'd.)
b.
LPCS XII actuated equipment remain in their abnormal l
. condition.
A component level operator action is re-quired to change state of actuated equipments.
l o
c.
ADS 1
AIT actuated valves (air operated) return to their i
normal condition hence changing state.
All ADS' l
solenoids de-energize in its own division, closing the ADS valves.
I d.
SRV XII actuated equipment remain in their abnormal condition.
t e.
RHR i
All actuated equipment remain in their abnormal condi-tion (e.g. pumps, injection valves etc.)
They have L
to manually signalled closed at the component level.
.f.
RCIC All actuated equipment remain in their abnormal condition.
}
The inboard / outboard isolation valves and the pump suction valve from the suppression pool are exceptions to-this.
4 g.
MSIV j
All MSIV remain in their abnormal condition (i.e.,
l closed).
A manual operator action is required for each i
valve to change its state.
4 5.
BOP ESF All BOP ESF actuation signals incorporate.a " seal-in" feature which. prevents the actuation signal from being-
[
reset until the' condition which caused the actuation has returned to. normal.
Therefore, an ESF actuation reset by itself will not cause any equipment to revert to a condition or mode'not required by the ESF actuation.
Equip-t ment which has a prescribed mode during normal conditions 4
may revert to this mode upon the ESF actuation condition:
returning to normal and the ESF actuation signal being reset.
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