ML19220C968
| ML19220C968 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/19/1979 |
| From: | Ahearne J NRC COMMISSION (OCM) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE), Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19220C958 | List: |
| References | |
| NUDOCS 7905160119 | |
| Download: ML19220C968 (2) | |
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Apcil i9, 1979 I;D10R;;d..; FOR:
Director, tar Director, ISE f\\
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a.m a I believe it v:ould be appropriate to take the follo. ting cctica:
response to the Hints raised recently by the ACR5:
1, Per, ast all pov:er rea ter licensees and the fcu r '. 2. dors provic'e e,c. ers ;c the fall:xing ques tions.
(L; E.n e t aj,utyred n tucet. c i rcu ; a t:. co cool..c;r s
(bj
'{ u t is the b m iar of thair reactor (s) in natural ci.cu-lation?
(c)
Are operato: i.:tructicns prm id:d for the proceJurcs go to naturcl circula tion cc:1 ing?
(d)
Is si. ula tor trainir.] a '. c i l a b l : to operatoes for na tu re.1 circula tion coaling?
This information could be re ;uested by a bulletin, to be providea in ten days.
In addition, the verdors and tne I!RC staff could be asked to pall together.. hat reports they have cn naturel circulation cc::lin3 2.
The ACRS has pointed out that pressurizer heaters will be a criti-cal requireutnt to maintain sui table overpressure on the reactor co: ling syste::' during na tural circula tion.
The 4CRS is concerned that pres su ri zec beaters ' e placed in cualifieJ cn-site pac.er sources "vith a suitable c
arrange:r.ent of heaters and po. er distribution to prcvide redundant capability." They r::cor.end, and I uauld agree, that presently op-erating ?"R plants should be surveyed to deterr.iine s. nether pressuri:2r 118 246
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_an be 1:.:ed or on-si te poc.or st rec ; cn? de t. :- tne heiters a n d p'_ :c :' d i s t r ; '.:u ' i o n a rra n c. e n t do r. necy. D ra.' 2ndan t cmoil i j Again, tt.is r'_que,L could be done b) a bull'2.in, with a ten da; r e s s. c u s e.
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re i s ?d a con:.ern tha F o., era tors hr/e a rathod of t a l l i:.g r.h a t t.hn coolant sysre is approcching the saturatica pressure corres.rojing to th2 core exi t tem,0 ;ra ture.
They point out "such a t.arnint;./Jy be deris.ed from pressurizar pressure instruncots and hot leg temperatures in conjunction with conlentional steam tables."
It would appear again that a t>ulletin request to the licensees could be in order, ask ing.. nether they t'o pro /ide such inforca tica and, e t a n ni-i mum, requiring them to providc at least an available chart ;hich would give the appropriate ster, table information.
In addition, a bulletin should rr;ues t in for# tien on wh2th?.- thernaccuples are installed in the rcac tor e.::d, if ins tall ed, wB t ra thv! is ava ilable for reading cu t thi s in for r.a t ion In pv ticular, is it a full-scale r_: ding ced is it avaii2-ble in real tire tc the cperators.
Once again, this informtion could be asked for ui thin ten days.
4.
' e.s wuld ask 1 ic >nseas anj v+n:.ws ehethrer they hwe anj nathods tO p ro;. ; '. f o r p ru'/ i e ! "] C i rec t rea d i n ' o f v.'a i.U r l 2V el i n ' h'.: core.
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