ML20148T622
| ML20148T622 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 01/21/1988 |
| From: | Leblond P COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 4092K, TAC-65487, TAC-65488, NUDOCS 8802030352 | |
| Download: ML20148T622 (5) | |
Text
. - _ _ _ _ _ _ _
/
N Commonwealth Edison
) One First Natonal Piaza. CNcago, Vanos
(
7 Address Repty to. Post OF4TBoT76F
\\
/ CNcago,lanos 60690 0767 x
January 21, 1988 U.S. Nuclear Regulatory Cctntnission Attn: Document Control Desk Washington, DC 20555
Subject:
Zion Nuclear Pcwer Station Units 1 and 2 proposed Amendment to Facility Operating License Nos. DPR-39 and DPR-48 Low Temperature Overpressure Protection NRC Docket Nos. 50-295 and 50-304 tac Nos. 65487/8 References (a): May 29, 1987 letter from P.C. LeBlond to the U.S. NRC (b):
December 22, 1987 letter from D.R. Muller to L.D. Butterfield 1
Centlemen:
Reference (a) transmitted a proposed amendment to Facility Operating License Nos. DPR-39 and DPR-48, Appendix A, Sections 3.3.2.0 and 4.3.2.6 - Low Temperature uverpressure Protection. Reference (b) requested additional information regarding the proposed amendment. This transmittal is providing the requested information.
Reference (b) requested information regarding three specific Ccomonwealth Edison Ccepany's response to these requests is provided
- areas, in the Attachment to this letter.
If any further questions atise regarding this ratter, please direct them to this office.
Very truly yours.
M d-a P. C. LeBlond Nuclear Licensing Administrator Attachment cc: Resident Inspector - Zion A. B. Davis J. A. Norris f00\\
4092K g
g 8802030352 880121 PDR ADOCK 05000295 P
r l
~
ATTAQ9mff MSRQNSE TO NRC R500tST FOR ADDITIONAhjNJORMATION 4
I HgARDIN0Jf9LTEMPERATURE OVERPRESSURE PROTECTION I
i 1
IL*a_t1 l
The flow rate of the charging and safety injection pumps will vary
[
with changes in reactor coolant system pressure and/or charging flow control valve position. Thus, the pump specific flow curves provide conservative, limiting flow information for these four pumps. Attached are the eight pump l
5 performance curves for the charging and safety injection pumps at Zion j
Station.
[
It et t2 I
The flexibility to allow two charging pumps to be operable for the l
purpose of maintaining seal injection flow to the reactor coolant pumps is i
)
only addressed in the limiting condition operation of the proposed technical l
]
specification. This flexibility is not denoted within the surveillance i
1 section because it is anticipated that dual pump operation will only occur f
for periods substantially less than five minutes. As a result, the i
appropriate criteria to be utilized for a shiftly surveil,'ance is the verification of the inoperability of the four of the five pumps.
This 4
j flexibility is being added to the limiting condition for operation to insure j
that dual charging pump operation during pump switch over would not be considered to be a violation of section 3.3.2.0.2.
i I
(
I Item 83 I
The existing Zion Technical Specifications state on page 94 i
- operability of each load temperatute overpressure protection charcel t
requires the control switch to be in the proper position,... ". The main
[
1 control board control switches for the PORV's have only three positions, j
These positions are open, auto (setpoint is 2335 psig), and auto low temp
]
(setting of 435 psig).
i I
Thus the explicit reference to a lift setting of 435 psig in i
section 3.3.2.G.1 can only mean that the main control board control switch I
has been placed in the "auto low temp position". Thus, the proposed amendment involges a clarification of the functional requirements for the i
low temperature overpressure protectien system.
(
In addition, should the PORV control switch be mispositioned below f
I I
an RCS temperature of 250'F, an alarm would be generated on the main control l
board.
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