ML17324A878
| ML17324A878 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 05/01/1986 |
| From: | Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17324A879 | List: |
| References | |
| AEP:NRC:0916S, AEP:NRC:916S, NUDOCS 8605060101 | |
| Download: ML17324A878 (7) | |
Text
I'EGULATOR NFORNATION DISTRIBUTION S EH (R IDS)
\\
AOOEBBZOg NBR: Bi5'050E01D~lIC. DATE: Bi57DYTO~OT'ARTIED: NO DOCKET~
FACIL:50-316 Donald C.
Cook Nuclear Palmer Plant.
Unit 2.
Indiana 5
050003ih AUTH. NAME AUTHOR AFFILIATION ALEXICH>N. P.
Indiana 5 Nichigan Electric Co.
RECIP. NAME RECIPIENT AFFILIATION DENTONA HA R.
Office of Nuclear Reactor Regulation~
Director (post 851125
SUBJECT:
Forwards revised proposed Cycle 6 Tech Specs 3/4. i. 2.7 5 3/4. 1. 2. 8 re borated tuater sources shutdollln w% operating.
respectivelg.
DISTR IBUTION CODE'001D COP IES RECEIVED'TR ENCL SI ZE-TITLE:
OR Submittal:
Qeneral Distribution NOTES:
RECIPIENT ID CODE/MANE PMR-A ADTS PNR-A EICSB PMR-A PD4 PD 01 PNR-A PSB INTERNAL: ADN/LFNB KuD
/TSCB REO FIL 04 COPIES LTTR ENCL 1
0 2
2 5
5 1
1 0
1 1
1 RECIPIENT ID CODE/MANE PMR-A EB PNR-A FOB MIQQINQTON> D PNR-A RSB ELD/HDS3 NRR/ORAS RQN3 COPIES LTTR ENCL 1
1 1
1 1
1 1
1 0
0 1
EXTERNAL: 24X LPDR NSIC 03 05 1
1 1
1 1
EQM BRUSKEA S NRC PDR 02 1
1 1
1 TOTAL NUNBER OF COPIES REQUIRED LTTR 24 ENCL 20
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h INDIANA8 NICHIGAN ELECTRIC CONPANY P.O. BOX 16631 COLUMBUS, OHIO 43216 Donald C.
Cook Nuclear Plant Unit No.
2 Docket No. 50-316 License No. DPR-74 REVISION OF PROPOSED CYCLE 6 BORATED WATER SOURCES TECHNICAL SPECIFICATIONS May 1, 1986 AEP:NRC:0916S Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nulcear Regulatory Commission Washington, D AC.
20555
Dear Mr. Denton:
The purpose of this letter is to transmit revised versions of our proposed Unit 2 Cycle 6 Technical Specifications (T/Ss) 3/4.1.2.7 and 3/4.1.2.8 (Borated Water Sources--Shutdown and Operating, respectively).
Proposed versions of these T/Ss were originally transmitted to you in our letter AEP:NRC:0916P, dated March 27, 1986.
In that submittal, we proposed to increase the borated water volumes required for the Refueling Water Storage Tank (RWST) and the Boric Acid Storage Tank (BAST), because of new analyses performed by Exxon Nuclear Company (ENC) in support of the Cycle 6 reload.
These analyses were extremely conservative, assuming that the Reactor Coolant System (RCS) was at 0 ppm boron prior to borated water addition to achieve the desired shutdown margin.
Because of the operational difficulties posed by the drastically increased tank volumes, ENC reanalyzed the tank requirements using more realistic assumptions concerning initial RCS boron concentrations.
Their evaluation, which has been included as Attachment 1 to this letter, concluded that our present T/S 3.1.2.8 requirements on the BAST and RWST volumes are conservative.
Therefore, we propose to maintain our present T/S and therefore wish to withdraw our proposed version.
For T/S 3.1.2.7, ENC determined that a BAST volume of 4,300 gallons, rather than the proposed 8,750 gallons, is sufficient.
Likewise, they recommended an RWST volume of 90,000 gallons, as opposed to the proposed 190,000 gallons.
The volumes cited are usable volumes.
They will be adjusted administratively to account for water not available because of discharge line locations and other physical characteristics, as necessary.
These changes have been discussed with members of your staff.
At their instruction, we are submitting revised versions of T/Ss 3/4.1.2.7 and 3/4.1.2.8, which contain the changes described above.
We are also submitting a revised T/S Bases page B 3/4 1-3, which has been revised to reflect the new ENC analyses.
Changes to our previous submittal are indicated by a double bar in the right hand margin of the affected pages.
Because these changes represent revisions to our previous submittal, we believe no additional fees are required per 10 CFR 170.12.
8605060101 8b0501 PDR ADOCK 05000316 P
r II
Mr. Harold R. Denton AEP:NRC:0916S These changes will be reviewed by the Plant Nuclear Safety Review Committee (PNSRC) and by the Nuclear Safety and Design Review Committee (NSDRC) at their next regularly scheduled meeting.
This document has been prepared following Corporate procedures which incorporate a reasonable set of controls to insure its accuracy and completeness prior to signature by the undersigned.
Very truly yours, M. P. Al xich
~i
~pic&
Vice President MPA/rjn cc:
John E. Dolan W.
G. Smith, Jr.
- Bridgman G. Bruchmann R.
C. Callen G. Charnoff NRC Resident Inspector
- Bridgman
Attachment 1 to AEP:NRC:0916S ENC Evaluation of Required Tank Volumes
Attachment This attachment 1s provided in response to a request for an evaluation of the 0, C.
Cook Unit 2
Technical Specification limits on borated water source contained volumes.
The request was made due to the 1ncreased shutdown margin requirement for operation on the residual heat removal (RHR) system.
The results obtained from the evaluat1on are provided below, For modes 1-4, the minimum contained volumes for the boric acid storage tank (BAST) and the refueling water storage tank (RMST) was found to be 3700 gallons and 118000 gallons, respectively.
These
- volumes, at the minimum boric ac1d concentrations, will allow boration of the rimary coolant from HFP, critical, equilibrium Xenon cond1t1ons to a
oron concentration sufficient to prov1de the shutdown margin required for Mode 4
RHR operation.
Because these values are smaller than those
-currently specified in the Technical Spec1fications, it 1s recommended that the current Techn1cal Spec1fication
- 3. 1.2.8 appl1cable to modes 1-4 remain unchanged.
The current values have been established per cr1teria which are different from that of attaining required shutdown margin which is used in this evaluation.
For Mode 5 minimum contained volumes of 2400 gallons for the BAST and 90000 gallons for the RMST are
- required, These volumes are sufficient to allow boration of the primary coolant from the boron concentration required fn mode 4, while one or more pr1mary coolant pumps are operat1ng, to a boron concentration which prov1des the shutdown margin required for mode 5
RHR operation..
Furthermore, this calculation indicates that the BAST volume required to borate from mode 4
to mode 6
is 4300
- gallons, This assumes a
boron concentration of 2000 ppm for mode 6 (Technical Spec1fication 3.9. 1).
It is recommended that these values (4300 gallons for the BAST and 90000 gallons for the RIItST) be included in the Technical Specifications for modes 5 and 6.
The volumes cited above are usable tank volumes.
They should be incremented by approprate allowances for line locations and other phys1cal characteristics for operat1onal use.