ML20082J205
| ML20082J205 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/19/1991 |
| From: | Creel G BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20082J209 | List: |
| References | |
| GL-88-17, NUDOCS 9108270238 | |
| Download: ML20082J205 (3) | |
Text
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. - - -. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. _ _ _ _ - -. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
., 4 13 ALT IMOfm GASAND ELECTRIC l
h,,,,,,
CHARl.ES CENTER e P.O. BOX 1475
- DALTIMORE, M ARYLAND 21203 1475 Geom ; g bi v n mov
%* < 4 e ha' -
(so,
,;a August 19.1991 U. S. Nuclear llegulatory Commission Washington, DC 20555 NITIINTION:
Document Can'.rol Desk SUlutiCT:
Calvert Clills Nuclear Power Plant Unit Nos,1 & 2: Docket Nos. 50 317 & 50 318 l1py.i ienfn_Lksr.c Amendmenuknurst l
RIIFIIRIINCIIS:
(a)
- 1. citer from Mr. O. C. Creel (110&l!) to N1(C Document Control Desk, dated November 5,1990, llequest for Amendrnent to Operat'ag 1.icenses (b)
Gencile letter 8817, hss of Decay lleat Removal," dated October 17,1988 Ocntlemen:
seu lly letter dated November 5, IWl'(Reference a), the llaltimore Gas and IIlectric (130&l?) Company submitted an Amendment request to its Operating 1.icense Nos. DPR 53 and DPR-69 for Calvert Cliffs Unit Nos.1 & 2, respectively, to change the Technical Specifications for Shutdown Cooling (SDC) and Coolant Circulation. The proposed request was piompted by Generie 1. citer 8817. It would climinate a Technical Specification for minimum SDC now rate during Mode 6 operations and replace it with a licensee established administrative control in the form of approved operating procedures. These procedures would require that SDC Dow be adjusted as necessary (but not below 1500 gpm) during refueling activities to maintain RCS temperature below the Mode 6 limit of 140"F.
The purpose of this letter is to revise our request in Reference (a) to retain a 1500 gpm required minimum SDC Dow rate in the Technical Speci0 cations, as shown in Attachments A and 13. We made the decision to retain this minimum Dow rate speci0 cation following a recent discussion with the NRC Staff, and we trust this action will assist you in the completion of your technical review of -
our request.
The purpose of the 1500 ppm limit will1,c to satisfy the low pressure safety injection (1. PSI) pump manufacture 's recommended minimum now rate. This limit is already in place in our procedures.
The adoption of this lower limit would not in any way preclude the use of higher SDC How rates as necessary to match the decay hea: load. During refueling when decay heat loads are relatively low, a l
Dow rate at or above 1500 ppm successfully removes decay heat while accomplishing the competing I
h 91002702309100j9
[' O '
l' j 0 ADOC 000 7
gDR
i y
+
l l
> Document Control Desk i
August 19,1991 Page 2 t
l icquirements of minimizing the potertial for vortexing at the SDC suction noule, and precluding imton dilution events.
l This revision would have no impact on the proposed determination of significant huards considerations tuhmitted in Reference (a). The basis for this conclur. ion rests on the fact that the l
originallleense amendrnent request contemplated the removal of all numerical limitations on SDC i
flow from the Technical Speellications, recognizing that competing safety concerns could best bc l
addres. sed within the context of plant operating procedutes. We indicated in Reference (a) that we j
had airceJy selected an absolute minimum flow rate of 1500 gpin based on LPSI pump design characteristics and that this limit had been proceduralized. Given these f acts, our decision to include this limitation I,i the Technical Specifications is conshtent whh the technical approach previously l
- proposed, inclusion of this limit in the Techr;ical SpeciGcations, which is a higher level j
administrative control, is a more conservative position than that originally proposed. Therefore, the 3
significant hazards analysis proposed in Reference (a) remains valid.
l Should you have any further questions regarding this matter, we will be pleased to discuss thern with you.
Very truly yours, p.-o
)
GCC/GT/gt/dtm Attachments: (A)
Unit 1 Revised Technical Specification and 13ases Pages (11)
Unit 2 Revised Technical Specification and Bases Pages cc:
D. A. Ilrune, Esquire l
J. E. Silberg, Esquire R. A. Capra, NRC D. O. Mcdonald. Jr., NRC T. T. Martin, NRC L E. Nicholson, NRC R.1. McLean, DNR J, IL Walter, PSC I
l l
L L
\\;
--.__..... _. __ >_.~.. _
?
t l
l KCfACliMl.ET IM I
I I
h
[
l i
f l
1 s
Unit I misnt Technical Specifienflon j
4 t
uml I
f
-l' i
11ases l' ages N4 9 8 l
l f
11N4 9 2 t
l i
t l-l l
llattimore Gas and Electric Company I)ocket Nos. 50 317 & 50 318 August 19,1991 i
i I
fP M'
w W'W 4up 4 4"*--
w w w rw%"r -vN u@
fr 9WT*W* * ' " ' 'FtfWi'*V' W'
T1 7'
u