ML19257A267
| ML19257A267 | |
| Person / Time | |
|---|---|
| Issue date: | 12/17/1979 |
| From: | Beard J Office of Nuclear Reactor Regulation |
| To: | Thomas Scarbrough NRC OFFICE OF STANDARDS DEVELOPMENT |
| References | |
| RTR-REGGD-01.141, RTR-REGGD-1.141 NUDOCS 8001030400 | |
| Download: ML19257A267 (2) | |
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UNITED STATES
'j NUCLEAR REGULATORY COMMISSION g
. t WASHINGTON, D. C. 20555 DEC 1719I3 NOTE T0:
T. G. Scarbrough, Reactor Systems Standards Branch FROM:
J. T. J'ard, GE ce;
, i. a ned Review Team
SUBJECT:
REGULATORY u.Jr.JE 1.141, " CONTAINMENT ISOLATION PROVISIONS FOR FLUID " :1 EMS," REVISION 1 As we discussed December 7, some of the language in this Reg. Guide needs to be improved editorically to preclude future misunderstanding.
Enclosed is some suggested new wording.
m Al --
J. T/ Beard GE L'essons Learned Review Team
Enclosure:
As stated cc w/ enclosure:
D. Tondi D. Verrelli R. Scholl 1667 038 J. Kerrigan 8001030
7 ENCLOSURE 1.
Section C.3,1st paragraph, after ist sentence add:
This sentence should be interpreted to mean that it shall not be passible for the reactor operator to override a containment isolation signal such that any isolation valve will be returned to its normal (pre-accident) condition by a single action. More specifically, neither the reset / override of the safety injection actuation signal nor the reset / override of a containment isolation actuation for a group of valves shall cause the re-opening of any isolation valve.
The design of the reset / override capability shall require, for the re-opening of each isolation valve, a deliberate pre-meditated separate action on the part of the reactor operator.
2.
Section C.3, 2nd paragraph, after 1st sentence add:
Where a design inadequacy exists that could result in the automatic re-opening of an isolation valve, the use of procedural controls to prevent such a re-opening is not be considered acceptable. Additionally, following the reset / override of an isolation signal, the manual re-opening of any containment isolation valve shall be controlled by written procedures which meet the requirements of 10 CFR 50.36(c)(5) Administrative Controls.
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