ML20235F108

From kanterella
Jump to navigation Jump to search
Submits Info in Response to Request for Operating Experience Info Re HPCI Sys.Sys Removed from Svc & Declared Inoperable 18 Times for Instrument Surveillance & Maint from 710503-720815
ML20235F108
Person / Time
Site: Monticello, 05000000
Issue date: 08/25/1972
From: Mayer L
NORTHERN STATES POWER CO.
To: Morris P
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20235B311 List: ... further results
References
FOIA-87-111 NUDOCS 8709280416
Download: ML20235F108 (3)
v • d • e


Text

_ _ _ _ _ _ _

/*

0, msn=  %  %

NORTHERN STATES POWER COMPANY M IN N E A PO Li s. M I N N E S OTA 5 5401 O q August 25, 1972 5 g

& Docr,ma 4 sJ

% Y PF E AUG281972> t O lb .

Peter A 2rris, Director Office of Operations Evaluatio

[gp AUSSSg,[;

DOCET nag . U.L na  % ,

Directorate of Regulatory Opera I United States Atomic Energy Commi t# 4 Washington, D C 20545 W .* /

Dear Dr. Morris:

MONTICELLO NUCLEAR GENERATING PIANT Docket No. 50-263 License No. DPR-22 HPCI Operating Experience Information The following information is submitted in response to your request for operating experience information regarding the High Pressure Coolant Injection (HPCI)

System. The data present covers the period from completion of system startup testing, m y 3, 1971 to August 15, 1972.

1. The HPCI system has been " removed from service"and " declared inoperable" eighteen (18) times for the purpose of routine instrument surveillance tests in accordance with prescribed procedures.

The HPCI system was " declared inoperable" an additional four (4) times and " removed from service" on only one (1) of these occasions.

(The system is considered " removed from service" when administrative instructions are implemented to ieolate or othezvise physically prevent the system from performing its function. 'Ibe system is considered "in-operable" when it is removed-from-service or fails to function in accor-dance with Technical Specifications.)

2. The cumulative removed-from-service time for instrument surveillance testing was approximately 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

Additionally, the HPCI system was declared " inoperable" for a cumulative total of 29 days. Of this total " inoperable" time, the system was"re-moved-from-service!' for only 16 days. 'Ihe plant remained in a condition of Power Operation only 4 days during the period when the HPCI was re-moved from service and van, placed in a condition of cold shutdown the remainder of the 16 day period.

n+ S $ "

py 8709280416 870921 l

! PDR FOIA 4701 MENZ87-111 PDR

{s O

i ~. Dr. P A Morris August 25, 1972 Page 2 3 The following zoutine tests were conducted on the HPCI system:

I' Total No (a)* (b)* '

(1). HPCI Pump Operability Test 19 13 6 (ii). HPCI Flow Rate Test- 11 11- -

(iii). HPCI High Steam Flow Isolation Test 18. 18 -

(iv). HPCI High Temperature Is;>1ation Test 14 14 -

' *(a . Functioned in accordance with design (b . Failed to function in accordance with design The six instances of " failure to function in accoztlance with design" as shown above for (1) .HPCI Pump Operability Test are reported as logged at the time these tests were performed. Subsequent evaluation indicated that five of these instances were not accountable as failures-to-function but Isther were attributable to surveillance test conditions of main steam line flow effects on the HPCI flow metering that would not be present for the design conditions under which the HPCI system must operate. In the initial instances, the system was declared inoperable while resolution was sought. 'Ihis is discussed in Ref. (1), (2), and (3). During this time, however, the HPCI system was able to function in accordance with design, as evidenced in Ref. (4).

Recent HPCI problems are discussed in Ref. (5) and (6).

4. During reactor operation, the HPCI has received a signal to operate one (1) ttne when the system was in service (Ref. 4) and one (1) time when the HPCI wasoutofservice(Ref.7). .

5 There have been no instances during reactor operation when the HPCI received a signal to start and failed to function in accordance with design.

We hope that this information is suitable for your needs.

Yours very truly, ML 0 Miyer, 0.P.E. %y Dizvctor of Nuclear Support Services LOM/DWJ/br l

Attachment:

List of references

! cc: B H Grier q

, l

l- .f r C ,. ~ ,~ Dr. P'A Morris- ,

  • Augtst 25, 1972.

G Page-3 l" ' bgdatuy Fue Cp '

l

References:

K J 9 ,, j ;; M-gg

! - (1). NSP letter to AEC, "Inoperability of the High Pressure Coolant Injection System," &nticello Nuclear Generating Plant, Ibcket No. 50-263, License No. DPR-22, R 0 Duncanson to P A Morris, dated September 15, 1971.

(2). NSP letter to AEC, "Inoperability of the High Pressure Coolant Injection-s System," Monticello Nuclear Generating ' Plant,. Docket No. 50-263,. License No. DPR-22, R 0 Duncanson to P A Morids, dated September 28, 1971 (3). NSP letter to AEC, " Planned 2 deifications to High Pressure Coolant In-jection System Steam Line Flow Sensing Device," knticello Nuclear Generating Plant, Docket No. 50-263, License No. DPR-22, L 0 Mayer'to P A Morris, dated March 2, 1972 (4). NBP letter to AEC, . " Reporting of Unusual Occurrences," Monticello Nuclear Generating Plant,. Docket No. 50-263, License No. DPR-22, R 0 Duncanson to P A Morris, dated October 5, 1971 (5). NSP letter to AEC, " Reporting of High Pressure Coolant Injection System Failure,".Monticello Nuclear Generating Plant, Docket No. 50-263, License No. DPR-22, L 0 Mayer to A Giambusso, dated July 27, 1972 (6). NSP letter to AEC, " Fast Start Failure of the High Pressure Coolant In-jection System," Monticello Nuclear Generating Plant, Docket No. 50-263, License No. LPR-22, L 0 hyer to A Giambusso, dated August 3,1972 (7). NSP letter to AEC, " Turbine Trip at 100% Power and Subsequent Events,"

Monticello Naclear Generating Plant, Docket No. 50-263, License No.

DPR-22, L 0 Mayer to A Giambusso, dated July 20, 1972 I

L-_dl___.__m -__z__ m..a mm. om__. -_ _ _ . _ _

Retrieved from "https://kanterella.com/w/index.php?title=ML20235F108&oldid=3191568"