05000000/LER-1977-005, Updated LER 77-005/1T:on 770114,failure of High Pressure Svc Water/Emergency Svc Water & Emergency Cooling Water Pumps to Meet FSAR Seismic Requirements Noted.Caused by Change in Calculation Techniques

From kanterella
Jump to navigation Jump to search
Updated LER 77-005/1T:on 770114,failure of High Pressure Svc Water/Emergency Svc Water & Emergency Cooling Water Pumps to Meet FSAR Seismic Requirements Noted.Caused by Change in Calculation Techniques
ML20086F137
Person / Time
Site: Peach Bottom, 05000000
Issue date: 01/28/1977
From: Cooney M
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086F058 List:
References
LER-77-005-01T-02, LER-77-5-1T-2, LER-LER-77-5-1T, NUDOCS 8312130068
Download: ML20086F137 (3)
v • d • e


LER-2077-005, Updated LER 77-005/1T:on 770114,failure of High Pressure Svc Water/Emergency Svc Water & Emergency Cooling Water Pumps to Meet FSAR Seismic Requirements Noted.Caused by Change in Calculation Techniques
Event date:
Report date:
0002077005R00 - NRC Website
v • d • e

text

-

O- O '

j PHILADELPHIA ELECTRIC COMPANY .

, 2301 MARKET ST.* LEET l

PHILADELPHIA. PA.19101 i (215) 84 t-4000 January 28, 1 U7 l .

. ./ .'

Mr. J. P. O'Rel liy l

l Director, Region 1 .

' Office or Inspection and Enforcement #

U. S. Nucicar Regulatory Comnission 631 Park Avenue -

y King of Prussia, PA 19406 -

Daar Mr. O'Reilly: ' ' ~~ y'

SUBJECT:

hortable Occurrence Folicw-up Report-1, Office of Inspection and Enforcement 14, on1977 JanuaryTheWritten following occurren notification was made to Mr. George I. car, Chief, Operating Reactors Branch

  1. 3, Division of Reactor Licensing and Mr. J. P. O'Reilly, Director, Region 1, Office of Inspection and Enfc,rcement on January 14, 1977. In accordance with Section 6 9.2.a of the Technical Specifications, Appendix A of DPR -

for Unit 2 and OPR-56 for Unit 3, Peach Bottom. Atomic Power Station, the following Event Report.information is being provided to supplement the attached i.icensee

Reference:

,' Docket Nos. 50-277 and 50 278-Technical Specification Reference 6 9 2.a(9)

I Report No.: 2-77-5/1T Report Date: January 28, 1977 l- Occurrence Date: Ja.uary 14, 1977 -

Facility:

Feach Cottom Atomic Power Station

- Units 2 and 3 R.9. 1, Delta, Pennsylvania 17314 l Event

Description:

During the perforr.iance of a sar'ety e val'aation of a proposed

,PIant modification, as .equired by the Peach Bottom Unit.1 2 & 3 qualit assurance progr.w, it we. four.d thac the High Pressure Service Water / y Ernergency Service Vate.-/ Emery ncy Coolir.g ht.sr a umos do not meet FSAR i

seisn.ic c* assification requiruvents. Tr.e. e have beer. no previous occur-tences.

8312130068 771005 l

PDR S ADOCK 05000277

.' . l

..,o , .

j

1 . ~ / .

l -.'J. P. O 'Rei l ly .

[ Jan~uary 28, 1977 ~o O 2 77-5/ir l

Pago 2 g use

Description:

analysis. The purchase specification for these pumps required a seismic This analysis was made using an equivalent static analysis technique which converts a dynamic loading to a static loading. Results of this analysis January 14, 1972.were received by our Architect Engineer (Bechtcl) on These results show that the pumps were capable of withstanding stresses.

the design scismic events well within quoted allowable The Architect Engineer, however, aware of pending project scismic specification changes relating to calculational techniques deferred his detailed review. In March 1974, the vendor was provided with the Philadelphia Electric Company approved General Project Class I Seismic Requirements Specifica*. ion. The vendor performed a seismic re-analysis using the dynamic analysis technique in accordance with the Specification to verify his equipment capability to withstand the design basis seismic events. The results of his re-analysis were reported to.

our Architect Engincer in November 1974, and indicated that the pumps were not capable of withstanding the design basis seismic events with -

in allowable stresses. The report also contained suggested minor modi =

fications to restore scismic Class I capability.

Philadelphic Electric Company. was advised of this recommended corrective action in Bechtel's letter to Philadelphia Electric dated April 9,1975 (BLP 12313); af ter which Philadelphia Electric authorized the preparation mentation of the engineering work package, including quality docu-requirements.

Because of the language in this letter, our engineers, although approving the work, did not assign a high priority to the in delay modifications.'

corrective action. This was an error, and is responsible:for the'.,.

  • essary modification sign-offs were It wassought.

not until late 1976.that.the nee -

assurance phase that the defici' n'cy It was during this quality ,

e of not meeting' the FSAR 'scisniic---

requirements was identified and prompt corrective action was initiated.

Corrective Action:

Equipment procurement is underway. Field work is expected to start on ESV and ECW pumps on January 31, 1977 Work on the HPSW

  • punps will start shortly thereaf ter. We plan to complete this work as soon as possibic. Specific modifications and schedules are as ' '

follows:

l. High Pressure Service Water Pumps:  ;

a.. Column flange bolts will be replaced with higher 8

strength material; ,

b. Bolts, are on order and delivery is expected on "

February 11, 1977. Efforts are being made to ,  ; ,

expidite delivery, t

4 6

e'

.... f. *

'M . J. P. O'Rei l ly -

January 28, 1977 O O sn 9or

page 3 l . t
c. Installation will begin upon receipt of materials and is expected to be complete by April 15, 1977 2 Emergency Service Water Purnps and Ernergency Cooling Water Pumps:
a. Lateral supports will be added at the top to the bowl assemblics f or these pumps. In addition, the motor hold down bolts for the Emergency Service Water Pumps will be replaced with higher strength material.
b. Material for lateral supports was roccived on site on January 27, 1977.

l

c. Installation will start on January 31, 1977 and will be errnpleted March 18, 1977.

With regard to the error in 'our quality review program whidh'"

f ailed to note the importance of this item and resulted in delayed implementation of corrective action, it is not expected that this type..

error will recur. Modifications to the Peach Bottom Plant are under -

strict administrative procedure control. This procedure requires section review of all proposed plant modifications and docurrentation of such review on approved document control forms. In 1975, when the deficiency regarding the seitmic design of the pumps was first brought to the attention of Philadelphia Electric, the use of this procedure was in its inf ancy. Considerable progress has been.mado -in complying %

with it.

Safety Imolications:_,

This occurrence .is believed to have minimal effect on plant safety because of tbc low pr obability of the occurrence of a scismic event of intensity equal to the design basis scismic event, and the short period of time required to impicracnt corrective action. The Operation and Safety Revi-w Conmittee has reviewed this matter and cpproved this course of action.

I i l .Very truly yours, .

i 1 . .

. . hj

, .k. J Cooney Su .intendent Generatlon civision-Nuclear Attechment .

cc Mr. Geo. ge Lc?r, Chicf -

Opera-ing Reactorc Or. nch #.7 .

Divisic.n of Oper st'ng Recctors ,

..e me

Retrieved from "https://kanterella.com/w/index.php?title=05000000/LER-1977-005,_Updated_LER_77-005/1T:on_770114,failure_of_High_Pressure_Svc_Water/Emergency_Svc_Water_%26_Emergency_Cooling_Water_Pumps_to_Meet_FSAR_Seismic_Requirements_Noted.Caused_by_Change_in_Calculation_Techniques&oldid=2735416"