ML19338G579
| ML19338G579 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 10/28/1980 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8010310263 | |
| Download: ML19338G579 (1) | |
Text
,e BALTIMORE GAS AND ELECTRIC COMPANY P. O. B O X 1475 D A LTI M O R E. M ARYLA N D 21203 October 28, 1030 Anisun E.LuNovut.JR v.cr pm.or.a suppLv Office of ?hiclear Reactor Ber'11ation U. S. 'fuelear Regulatory Cornission k'ashincton, D. C.
I'0555 Attn: . Pobert A. Clark Chief Onerating Reactors Branch #3 Division of I.icensinc
.c b.icet : Calvert Cliffs *;uelear Power Plant u
9
'Jni ts ? os. 1 fc ?. c ?ket s
- cs. 50-117 & 50-11 t' ira Protection "odifications
Reference:
(a) W E letter dated A/20/80 from A. E. :undvall,.'r.
to R. A. Cla*k, s nJw s ubj ec t.
Gentlenen:
Reference (rt) contained revisions to our Fire Razards Analysic vhich described a chance to our previously-submitted annroach to nrotection of safe shutdown eauipnent inside containment.
In addition to the use of existine fire nrotection features, characteristics and equinnent our annrnch included the fo11 ovine modifications:
- 1) Addition of a reactor coolant pump motor lube oil collection system.
P) Fire detection in cable trays in the electrical nenetration areas and in reactor coolant prin hay areas.
- 3) Covering all exposed cable and trays with two annlications of Flanenastic fire resistant naterial.
h) Where redundant safe shutdown racevavs are located within 10 feet of each other and are not separated by nhysical barriers, we are reroutine the racevay(s) or providine a physical barrier of
?'arinite board. This apnroach was based unon (a) our own design and testinr procrams, (b) the latest, thouch not final, RC criteria (Draft 10CFR50 Annendix R and the Calvert Clif fs Gafety Evaluation Report); and (c) comunications, both romal and informal, with !aC staff. Althourh we did not receive a resnonse to reference (a), we continued with design and procurenent in prepara-tion for the Unit I refueling outare (which beran October 17).
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Mr. R. A. Clark Pare P October 23, 1930 e
From the nost recent draft of Annendix " and from several recent conversations with your staff, we conclude that we vill receive little or no credit for installation of Flanenastic or Marinite barriers.
In addition, the renarntion requirement that vns nreviourly 10 "eet ir new PO feet. Va deteat no concencun anonc 'PC sta ff on what vill ha sn accentable annroach nFter resolution of the Annendix R proceedinc, and are there# ore nodifyinc our clans #cr inside containment as foll ows :
1I Reactor coolant vu-n notor lube oil - s e e u before.
- 9) 'etection - same as before.
1)
"la enantic - daleted.
h) "arriers /Sernration '/odifications - del eted.
'< n consider this annrosch to Fe accentnM a, bo+5
@crt nd lorr-term. for reasons ite-ized below.
All o' theno corr'darat' ns h tve 1 ocn nreviously discunned in detail in our rire Hamrde Ant!crin nn! cther corranrandence.
- 1) Exintinc silicone rubber-insulsted. H anr braid, n enston iac.>eted cable for all instrumentation, control and lov rover annlicatienr.
The nuncrior fire resistance nroperties of this cabla h'ive been the subject of much trevious corresnordan4 '.
- 2) Existing cor.nliance with 'erulatory Guide '.75 as to scrsretion of cab]e.
- 7) "ininizstion of Combustibles:
a) essentially no trancient fire hazards durirm onoration due to strict controls and limited accecs.
b)
Isolation of the major fire hazard and annroxinstelv half the total containment fire load throuch new irstsIIntion o" the reactor coolant nunn notor lul.e oil collection sycten.
c)
Mev in-trav detection in all cable trays in the nenetration area, the other najor cource of cor.bustible naterial, b) Addition of detection in a'l areas containing sirnificant conbustible losd - RCP bay areas and cable trays.
- 5) Existing fire hose stations inside containment, and adequate nrocedures for use.
C) The Containment Spray Syaten could be used to control a fire even thourh not cririnally designed for fire protection.
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n tober '1, 1090 nace 3 e
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9 A. clark e
Ve are proceedine with tre finit o'itare baned en the anrrench described rd ove.
W vould be hanpv to discuss nr.y questionc with you nt your convenience.
"e tt truly yours, b
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A. Fiddison, Fsquire P. F. "'rowbridce, Fcouire
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