ML20212J418
| ML20212J418 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 03/02/1987 |
| From: | George Thomas PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-NUREG-0896, RTR-NUREG-896 NYN-87024, NUDOCS 8703090023 | |
| Download: ML20212J418 (3) | |
Text
,
George S. Thomas vice Preederd Nuclear Produckm Public Service of New Hampshire NYN-87024 March 2, 1987 United States Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
Document Control Desk
References:
(a) Facility Operating License NPF-56, Docket No. 50-443 (b) USNRC Letter; Dated February 3, 1987, " Inspection Report No. 50-443/86-54"
( c)
PSNH Letter NYN-87013, Dated February 9,1987, " Request for Additional Information" Subj ect: Response to Inspection Report No. 50-443/86-54 Gentlemen:
In accordance with the requirements of the notice of deviation identified in Reference (b), enclosed please find our response to that deviation.
Should you have any questions concerning our response, please contact Mr. Warren J. Hall at (603) 474-9574, extension 4046.
Very truly yours, foyY George S. Thomas Enclosure cc:
Regional Administrator U.S. Nuclear Regulatory Commission - Region I i
631 Park Avenue King of Prussia, PA 19406 Mr. A. C. Cerne NRC Senior Resident Inspector Seabrook Station Seabrook, NH 03874 f60I 0703090023 B70302
- (
PDR ADOCK 05000443 O
PDR P.O. Box 300 Seabrook, NH 03874. Telephone (603) 474'-9521
-. - _ -_ - ~_
~ _ _
i ENCLOSURE TO NYN-87024 NHY RESPONSE TO NOTICE OF DEVIATION Notice of Deviation The Seabrook Station FSAR, Section 9.4.1.1, provides the design bases for the Control Room Complex heating, ventilation and air conditioning system. It states that, due to the redundancy of the systems, no single active failure.
will cause a loss of both Control Room Complex makeup air systems.
It further states that the Control Room makeup ventilating system is capable of maintaining a positive pressure within the complex at all times and is designed to remain functional during an assumed loss of offsite power concurrent with a single active failure.
Contrary to the above, the Seabrook design for the Control Room makeup ventilating system, as implemented, provides for automatic isolation of the redundant makeup air trains, given a failure of one vital bus. Thus, a positive pressure cannot be maintained automatically within the Control Room Complex, assuming this single active failure, unless manual operator actions are implemented outside the Control Room Complex. The NRC safety evaluation for the Control Room makeup ventilating system (reference: NUREG-0896, Section 9.4.1) documents no consideration of the need for manual action in evaluating the acceptability of this system to " automatically"~ maintain the Control Room within environmental limits for uninterrupted safe occupancy of manned areas during all operating modes and in the event of a single active failure.
This apparent discrepancy between the actual system design and the commitments made in the Seabrook Station FSAR, and as evaluated in NUREG-0896, represent a deviation.
7
Response
)
New Hampshire Yankee (NHY) concurs that the Control Room Makeup Air Subsystem was'not designed to maintain a positive pressure within the Control Room Complex at all times. However, excluding this positive pressure requirement, FSAR Sections 6.4.2 and 9.4.1 do provide an adequate description of the actual system design (i.e., complete isolation followed by manual realignment).
i Further details regarding system design and operation can be found in l
Reference (c) of the cover letter. Therefore, because of the inconsistency in
+
the FSAR, NHY agrees that there is a discrepancy between the FSAR and the actual system design.
l This inconsistency will be resolved in a future amendment of the Seabrook Station FSAR.
In addition, NHY has also taken the following actions to ensure that the design objectives of the system are fully understood by the operating staff:
i f
I i
1
__,,,__,.__,,,e
- y,,,
,%____-___,_-,_r..
y
,--m.
. ~,
-v-y_-,
v m
m--,--
..,. - ~.. - -, _. _ _ _ _ _ _ _.
_,..-,___,_,,,.~_-,.-m.,,,_,_,,.
y....
A clear definition for single train operation of the Control Room Makeup o.
Air Subsystem has been established and will be provided to each Shif t ;
Superintendent.
o Abnormal Operating Procedure OS1223.01, " Response to Control Room Ventilation Isolation," has been revised to better delineate proper
. operator response requirements upon receipt of a CBA isolation.
i As indicated in Reference (c), NHY expects to make some system modifications
. prior to full power authorization. The details of the modifications will be submitted to the NRC for review prior to implementation.
7' 4
?
4 s
n 4
I i
):'
-f w.
et E
4' y
y sd
[.
1 >
. ~
9
'I p
e
)
.s A
.m e t
1
}^
/
[
i u
I t'
f
}
l L~
,?~
n e
s l
t t
i e
{
j F
n.--
,--,,,w
,..,.,,_,-w,----,
.....n
- -,,,.,. -, -., -