ML20199H834
| ML20199H834 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 11/19/1997 |
| From: | Mitchell T PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20199H840 | List: |
| References | |
| NUDOCS 9711260237 | |
| Download: ML20199H834 (5) | |
Text
.
hixh Ikittizvi Ausris Ibwed Statui
.PECO NUCLEAR nm t-w c-<
1848 Lay ikund e
A Unit of PECO Energy ga4Ag40032 f an 717 450 4243 November 10,1997 Docket No. 50 278 License No. DPR 50 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
Subject:
Peach Bottom Atomic Power Station, Unit 3 Operating Strategy Pending Repairs to Jet Pump Riser Piping
References:
- 1) Letter from T. N. Mitchell to U.S. Nuclear Regulatory Commission, dated 10/30/97, same subject I
- 2) Teleconference between PECO Energy, GE Nuclear Energy and U.S. Nuclear Regulatory Cornmission, held 11/10/97 i
This letter is in response to your request to provide information, in writing, regarding the operating strategy which is currently in place for Peach Bottom Atomic Power Station, Unit 3. This strategy was developed in response to Jet Pump riser cracks, which were identified during the recent Unit 3 refueling outage (described in Referenced letter and telc:en).
The operating strategy, which is supported by conservative and detailed analysis, allows safe continued operation of Unit 3, while a repair is designed and installation planned. The analysis also confirms the acceptability of normal full power operation.
The Plant Operations Review Committee (PORC) has reviewed and approvad
' the detaifed analysis and the specific operating strategy, which was evaluated under the 10CFR50.50 process. Please note that future chan]es to the operating strategy will also be evaluated under the 10CFR50.59 process and reviewed and approved by PORC.
QUj m
l
- pa s!I M "n 2
allIE!Illt40I l
r 1
i
i i
No,vember 19,1997 Page 2 To provide specific understanding of the operating range supported by the analysis, the following Recirculation System drive flow / operating period approaches are acceptable:
Nominal Recir. Drive Flow-Period (Hrs.)
75% or less 17,520 (1 Cycle) 80%
6,000 (Approx. 8 months) 91 %
2,000 (Approx. 2.5 months)
Present Operating Strategy 3,024 (Approx. 4 months)
Present operating strategy includes: 2224 hours0.0257 days <br />0.618 hours <br />0.00368 weeks <br />8.46232e-4 months <br /> at 80% nominal drive flow and 800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> at 91% nominal drive flow There are numerous other operating strategies which, once evaluated, would also be acceptable under the analysis. The latest revision of the safety evaluation approves the Present Operating Strategy fo, Unit 3.
In order to ensure that the Jet Pump riser cracks will remain smaller than the limits prescribed in the analysis, the integrated effect of operating Unit 3 at these Recirculation System drive flow levels over the course of this operating cycle has been conservatively analyzed in accordance with the safety factors typical of ASMF. Code calculations, As stated above, the operating strategy may be varied and will be evaluated under the 10CFR50.59 process to assure operations are mainta!ned within the analysis. Please note that the original safety evaluation which was attached to our Referenced letter has been updated since its submittal to the NRC. A copy of the current safety evaluation is enclosed for your information.
To assure that Unit 3 operation stays within the bounds of the analysis, Operations is responsible for maintaining Recirculation System drive flow in accordance with controlled procedures. In addition, Engineering will maintain responsibility for timely review and evaluation of the Recirculation System drive flow run times, as well as mor.itoring for analysis compliance.
1
' No'vember 19,1997 Page 3 If you have any questions, please do not hesitate to contact us.
-Very truly yours,
$ p f)A
=
T. N. Mitchell Vice President Peach Bottom' Atomic Power Station enclosure cc:'
H. J. Miller, Administrator, Region I, USNRC R. S. Barkley, USNRC Senior Resident inspector, PBAPS i
i t
1 J
Exhibit AG-CG-4-1, Rev. 4 Effective Date: 08-21-97 PORC / SQR / Chesterbrook Review & Approvs1 Form i
- Section 1 - Description of Item *****************
- 1. Item (s). (Procedure or Document 8, draft rev W Title):
10 err 90.99 R6 view Foc der PMP Trice 6AAL REEU6. c.$c*:.uGG, OctT ~3, EW.1 Documents to be superseded: _fOcFO/').M 9E,/ tex 6er2 4er Pwv TbciteA. smale. cocnW.,ouir 5, f>M l bbb Group: M M, M ddP-Est: 807* AEB7.,
- 2. Prepared By:
- 4. Full Descript60ft of Acuvity or Change: _ CA$c4 n
Auna @ctde. OittVE. Fu:v.y; oF (635 48*/Le [uaov) r,t eco W.s No l3,35N/p o
[Woh I0' 62. TetIN MS, Tf446 Soff flf"#lGV WILL. '",Ol%3d4" #21.1 Cf OdM. DO'lBM.
- 5. If a T C is being fully incorporated in this change, list T C#(8) here (af mutuple documents approved on this inrm, state which procedures incorporate which TC's):
s Review and Planning of Activity *************
- Section 2
- 6. Applicable stems in AG CG42 table are satished and commitments annotated. Preparer's inibals: 836
~
Ga. For Admin Procedures AA-C 5 checkhet completed and attached. Preparer's Inibals:
IMA 7 Mechanisms in place to implement training. Preparer's inibals:
$28-Training Review (LGS only):
j Aill*75to t
- 8. Procedure Cause Codes (ese back). List the prog am that initiated this change : OM Sa. List below the program that failed to idenbfy the change before the one in step 8:
Program: N Give Bas:s for determinabon:
lWl P01 SE*-. M "I3'O NM 9.10 CFR 60.59 Review. check appropria:e item and attach review as necessary:
Determination Only NO Review Req'd per LR C.13 (heinor Non. Technical Revision)
No Rev6ew Req'd (provide basis in desenp)_
Safety Eval (PORC req'd)$ USQ: Yes No$,
10.10 CF R 60.54 Reviewe (EP, Q A Sec Plan changes or for LGS only, environmental impac.t). attach review
- 11. Document Services instructions:
Procedure Use (circle one):
1 il lil l
Espedited Distribution (24 hrs) l Normal Distnbution Hold
Contact:
Weed by date:
Other instructions:
Specific Effecuve Date if req'd:
(Weekly tests performed daily should have a Monday eff date)
SQR/RS Review and Approval **************
- Section 3
- 12. Cross Discipline Review. perform per Exh AG CG-4-2. Attach add'l sheets as necessary.
SQRXD Name Site / Group inibals Date SQRXD Name SitelGroup initials Data fail 2, CAO Preparer 022 sl6ol0 I
l Aim.T Ph iws/6eetr MF noIn l
[
Preparer's initials that all comments resoJved: ME SQR iniba)s of no-cross discipline review:
13..SGf0Mgr Review Signature:
Mb _
Date: A W
13a. Quality Revis wer Signature (for Quali y admin procedures):
Date*
- 14. Responsible Supenntendent (St Mgr or r for CB) Review / Approval check appropriate box:
Reviewed and Approved Reviewed ty RQ q'd Rev4wed Only P8 Mgr Approval req'd (LGS only)
RS (Sr Mgr or Dir for CB) Signature:
N S C*8 A le# / o, Date: _.11 l Il N v y
/
v
/
\\
t
/
i l
l Exhibit AG-CG-4-1, Rev. 4 Page 2 of 2 PORC / SQR / Chesterbrook Review & Approval Form Item (s) From Line 1 - (Procedure or Document #,
draft rev #, Title):
socre%58 kned %t der RMP TkwM. sted crx46 ; on'r S; frg 2-
- Section 4 - PORC Review **********************
I
- 15. PORC Review
/
7 Approval Reco.vimended i
Approval Recomme'ndet, wt below resolution Reviewed Only, no acbon taken Romanded items for Resolution f
Resolution CNecked by:
Date:
PORC Mtg8.. i 7' O b 7 /t ll!I I[
PORC Dat 0
PORC Chairman Signature:. _
\\ $- __
G
/
+
- 16. Walkaround PORO (limited use only. see AG CG 4):
PORC Chairman Approval for walbround:
Walberounds; Date:
Initials sign #fying acceptance by PORC members / alternates (ensure at least 4 individuals of which at least 2 are mornbers):
t PORC Chairman Approvalofitem:
Date:
- 17. Plant Manager (as no ary o ibi 2):
Piant Manag,er: '
Date: ll iI l
NQA/QR App /
roval:
Date:
Vice Pres 6 dent:
Date:
(for Directives ordy)
- 18. PORC Minutem (req'd for ali stems presented to PORC or PORC Walkaround, whether approved or not. Provide elactronic copy to PORC Sec'y. see Exhit it AG-CG.4 2 for minutes requirernents).
- Procedure Cause Codes ************************
- The fnliowmg cau_se codes are to be used when answering 6tems 8 and Ba on first page of form:
CT P. Commitment Tracking /Operaung Exponence PEP (*). Performance Enhancement Program Program 090. Deseqn Basse Document Program PPIS (*). Procedure Performance improvement System DCR. Design Change Request Program SET. Setpomt Change Program DEC. Design Equiva6ent Change Program TCP(*). Temporary Change Process LIC. L6censmg Program (e.g, Tech Spec, UFSAR)
TPA. Temporary Plant Alteration Program MOD Mod Process (Beg)
VEM. Vendor manual Program MPC. Mmor Physical Change Program OTH. An Unheted Process hatin bases (step 8a)
(*). When this program is idenbfied for insbeting a change to a procedure, consideratson should be given that another process should have or could have instieted this change earher.
..