ML20079J703
| ML20079J703 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 12/14/1982 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 19114, 82-14, 82-14-#1, MCAR-65, NUDOCS 8212280320 | |
| Download: ML20079J703 (7) | |
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Consumers Power
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and Constraction General Offhes: 1945 West Pernell Road, Jackson, MI 49201 e (517) 78&O463 December 14, 1982 S2-14 #1 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND NUCLEAR C0GENERATI03 PLANT -
DOCKET NOS 50-329 AND 50-330 AUXILIARY FEEDWATER SUCTION PIIING FILE:
0.4.9.70 SERIAL:
19114 This letter is an interim 50.55(e) report on a potential deficiency in the design of the auxiliary feedwater suction piping. This was reported to Mr R Gardner of your staff on November 16, 1982. The attachments to this letter provide a description of the deficiency and the corrective actions being taken to resolve this problem.
Another report, either interim or final, will be sent on or before March 10, 1983.
I JWC/WRB/lr Attachments:
(1) Management Corrective Action Report MCAR-1, Report No 65, dated 11/16/82 (2) MCAR-65. Interin Report 1, dated December 1, 1982 CC: Document Control Desk, NRC Washington, DC RJCook, NRC Resident Inspector Midland Nuclear Plant 8212280320 821214 PDR ADOCK 05000329 S
PDR Oc1282-0015A-MP01
2
-SERIAL 19113 82-13 #1
-CC.CBechhoefer, ASLB Panel RSDecker, ASLB Panel-FPCowan, ASLB Panel JHarbour, ASLB Panel AS&L Appeal Panel MMCherry, Esq MSinclair BStamiris CRStephens, USNRC WDPaton, Esq, USNRC FJKelley, Esq. Attorney General SHFreeman, Esq, Asst Attorney General WHMarshall GJMerritt, Esq, TNK8J Great Lakes QA Managers OC1282-0015A-MP01
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' QUAUTY ASSURANCE PROGRAM MANACE~'ENT CORRECTIVE ACTION REPORT serial 19114 MCAR-1 82-lh #1 i
65
.h.dJ4656 REPORT NO.:
JOB NO.:
7220 Q NO.:
DATE:
11/16/82 i DESCRIPTION * (including References):
The de' sign for the suction piping, ASME III class 3, 150f ANSI rated auxiliary feedwater system does not have overpressurization protection.
If the AFW pump is tripped, backflow and/or leakage could possibly occur through the discharge swing check valves while they are closing.
(continued on page 2)
Tn N a N N $h k ed br M red corrective action to provide suitable overpressure 1.
protection to the suction line between the AFW pump and the check valve.
2.
Determine root cause of this deficiency and take the appropriate action to preclude recurrence.
3.
Depending on the results of action (2) above, determine if a similar problem could sxist in any other system design.
4.
Issue the first interim report by December 1, 1982.
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MCAR 65 Page 2
'OS4656 Description (con't.)
Lack of overpressurization protection could allow pressurization of the piping to above the design rating should the check valves in the AFW discharge piping cllow backflow or leakage. While no piping damage is expected, essential instrumentation in the suction line could be damaged causing failure of the interlocks designed to support system design bases one and four (FSAR Section 10.4.9.1.1).
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Attachm:nt 2 ci u96369 Serial 19114 s
82-lh #1 096I96 Management Corrective Action Report (MCAR)
Subject:
MCAR 65 (Issued 11/16/82)
Concerns for Auxiliary Feedwater Suction Piping Overpressurization laterim Report 1 Date:
December 1, 1982 Project:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Description of Deficiency The design of the auxiliary feedwater (AFW) system does not provide the 150# ANSI rated suction piping with overpressurization protection.
Absence of such protecticn could allow pressurization of the piping to above the design rating should the check valves in the AFV discharge piping allow backilow or leakage. Should this condition occur, essential instrumentation in the suction line could be damaged causing failure of the interlocks designed to support system design basis one and four (FSAR Section 10.4.9.1.1).
Summary of Investigation and Historical Background When the AFW pump is tripped, backflow and/or leakage could occur through the discharge swing check valves while they are closing. Because the suction piping check valve could prevent any backflow through the suction piping to the suction source, overpressurization in the AFW suction piping could result. Such an event occurred at the McGuire 1 plant during a malfunction of the minimum recirculation valve and resulted in water leaking f rom valves and instruments located in the suction piping.
The Midland plant AFW system (Units 1 and 2) is similar in design to the McGuire 1 Plant. Prior to the overpressurization problem, backflow pressure at the McGuire 1 plant had been relieved through the recirculation line to the upper storage tank. The Midland design also employs a recirculation line to the condensate storage tank. However, unlike the McGuire 1 plant, the Midland minimum recirculation valve logics require (in addition to a low flow signal) a pump running signal to open the recirculation valves. Thus, when the pump is tripped, there would be no flowpath to protect the suction piping due to backflow or I
leakage through the pump discharge valves.
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.96369 c,.
$$lgg MCAR 65 (Issued 11/16/82)
Interim Report 1 Page 2 Analysis of Safety Implication Overpressurization of the suction piping could cause damage to the pressure transmitters which are necessary for the automatic actuation of the power-operated valves for switchover to the safety related service I
water supply in case the Condensate Storage Tank (CST) and Deaerator Storage Tank (DST) are not available.
Probable cause The design of the Midland and McGuice 1 auxiliary feedwater systems utilizes check valves on the pump suction. On systems utilizing check valves on both the suction and diccharge of a pump, the potential f or leakage with subsequent overpressurization has not been generally recognized.
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Corrective Action j
The following actions are being pursued te resolve the above problem:
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l 1.
Install suitable overprotecticn device en the AFW suction line i
between the pump and the check valve. Desfan resolution will be further discussed in the next interim report.
2.
Investigation to determine if similar situation exists in any other system in the Midland plant will be discussed in the next interim report.
Reportability Based on the potential safety concerns, this item was considered potentially reportable under the criteria contained in 10 CFR 50.55 (e).
9 MCAR 65 (Issued 11/16/82)
Interim Report 1 096196 Page 3 096369 N..g/
Submitted by:
T.G. Ballweg'
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Mechanical Group Supervisor Approved by:
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E.M. Hughes N
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Ann Arbor Project Engineer
-1 Concurrence by:
ifF M.T. Fravel Chief Mechanical Engineer
.l Concurrence by:
o E. Smith Engineering Manager
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Concurrence by:
M.A. Dietrich Project Quality Assurance Engineer TGB/ARE/lb(M) 112403/7
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