ML19322C526
| ML19322C526 | |
| Person / Time | |
|---|---|
| Site: | 05000561, Green County, Crane  |
| Issue date: | 06/22/1976 |
| From: | Shapaker J Office of Nuclear Reactor Regulation |
| To: | Tedesco L Office of Nuclear Reactor Regulation |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001170854 | |
| Download: ML19322C526 (4) | |
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NUCLE AR r.F GULAT ORY cC.*.**.'.lSSION
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4 Rcbert L. Tedesco, Assistant Director for Plant Systems, DSS 6 THRU:
Gus C. Lainas, Chief, Containment Systems Branch, DSS,e (
PROF 0 SED POSITION 03 B&W CONTAllEEHT ISOLATION SYSTEli Standard Reviet.- Plan 6.2.4, Containment Isolation, specifies in Item II.6.
of the Acceptance Criteria that there should be diversity in the parameters sensed f ar the initiation of containment isolation.
We have noted that B&W plarts do not satisfy this criterion. With your concurrence, we plan to implement this acceptance criterion on DOW plants beginning with the Gre3ne Cecaty Nuclecr Power Plant and BSAR 205 which is the B&W Standard USSS desicn.
A brief description of the Engineered Safety Features Actuation System (ESFAS) for the Greene County fluclear Power Plant will demonstrate the lack of diversity in the parameters used for B&W plants.
The ESFAS is the pro-tection system that initiates acticn of various engineered safety feature devices to mitigate the consequences of a LOCA or secondary system rupture..
The ESFAS initiates, in part, the following:
1.
Emergency cora cooling injection, and secondary system isolation and cooling (ECCI initiation), and 2.
Containment isolation and cooling (CIC initiation).
For ECCI initiation, the ESFAS monitors reactor coolant system pressure, containment pressure (4 psig), and steam line pressure.
Upon detection of out-of-limit conditions for these variables, the och lines that will be isolated are the main steam and main feedwater lines, the decay heat removal syster: return line, and the makeup and purification system letdown and seal return lines.
Also, safety related lines will open.
For CIC initiation, the ESFAS monitors containment pressure (4 psig). Upon detection of out-of-limit conditions for this variable, the remainder of the lines penetrating containment. that are not safety related will be isolated.
It should be noted that the Westinghotse containment isolation philosophy is.-
just the opposite of B&U's, in that the bulk of the lines penetrating contain-ment are isolated by diverse signals, including los containment pressure and safety injection, and only a few lines are isolated or. high containment pressure. We believe that B&W should adopt a similar approach and i. alate
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especiu atmnphere such as the containment purge system lines.
to enforce our position as stated in Standard Review 1:ith your cpproval, we will inform B&W of our intentions via the Greene County and 35AR 205 applications.
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. James H. Shapaker, Section Leader Containment Systems Branch Division of Systems Safety cc:
J. Glynn G. Lainas J. Kudrick F. Eltawila T. Greene FILE:
Greene County BSAR 205 e
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