ML19329E321
| ML19329E321 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 01/13/1978 |
| From: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-77-05A, IEB-77-5A, NUDOCS 8006120628 | |
| Download: ML19329E321 (3) | |
Text
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oeneral offices: 1945 West Parnell Ftoed. Jackson, Michigen 49201
- Area Code 517 7884453 January 13, 1978
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MIDLAUD PROJECT
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DOCKLT UO 50-329, 50-330 IS DULLETIII 77-05A FILU: 0505.2 SERIAL: h683 On January 6, 1970, we provided you a partial response to IE Bulletin TT-05A in regard to Lalance of Plant Equipment. This letter completes that response and covers liSSS equipment as supplied by the B W Company for the Midland Plants Unit 1 and 2.
BW has reviewed the equipment supplied for Midland Unit 1 and 2 and determined that systems contain a variety of electrical connector assemblies. The connectors are located in three general areas: Control room, auxiliary building, and contain-nent.
These connectors have been evaluated under the following assumptions:
A.
The containment environment design basis accident (DBA) is a loss of coolant accident (LOCA), and the containment envircnnent for all other accidents is enveloped by these conditions.
B.
Connectors in the auxiliary building and the control roon vill be exposed to no environ:l ental concitions more severe than the design rance conditions.
Specific parameter values for these conditions are contained in the Midland Plant FSAR. Under these assumptions, ve have determined that 3D supplied electrical connector assemblies which may need to be reported in response to IE Bulletin 77-05A are qualified as folleva:
1.
Control Room All control room equipment with connectors was succcssfully tested to design rance conditions.
2.
Auxiliary Building Auxiliary building equipment supplied by 31.1 includes the control rod drive control system (CRDCS) and pressure / level /ilev transmitters. The Claco IE 8006120 g
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O Ssrial 4608 Nrtion of the CRDCC with connectors has been qualified to design rance con-ditions the qualification of transmitter connectors are identical to those described below in 3A.
3 Containment A.
Transmitters: Pressure transmitters use Conax fittings (pressure seals to isolate vire terminal points from the environment). The followin6 B&W supplied transmitters are required to operate under accident condi-tions; the connectors supplied with these transmitters have been qualified to the containment environment DBA (LOCA).
TRANSMITTER QUALIFICATIO:i Bailey Meter Ccepany Bailey Heter Cc=pany Report BQ and KS QH-h202-E21-20 en file at B&W B.
Power ranse nuclear instruments: The UI are supplied through B&W by a subvendor, with triax connectors. These connectors are located in a connector box embedded in concrete above the detector thimble; the box is sealed with a Casket. With respect to these connectors:
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- 1) The B&W subvendor states that these connectors are qualified to a i
design range temperature of 200 F.
ii) The UI provides primary trip protection on s n11 steamline breaks 2
(SSLB) (less than 2.0 ft ) and rod ejection accidents (REA). Each of these accidents may result in containment environments which produce containment te=peratures in excess of 200 F.
0 iii) It is B&W's judgme - 9at the location of the connector in the connector box vil:1
____.:it the local connector conditions to within design ranSe during the UI required period of operability. This conclusion is based on the following:
-The NI is required to function within 5 seconds for the design basis REA. The UI connector is not expected to be adversely affected by the environment resulting from the REA during this interval.
-The required period of opegability for the NI during a SSLB depends upon break size: A 2.0 ft break assumes a flux trip at approximately 8 seconds. The required period of operability for the NI during a steamline break of scall break sizes is dependent on numerous parc=cters.
However, the maximum period of time that the NI would be required to operate is less than 15 seconds. The ill connector is not expected to be adversely affected by the environment resulting from a SSLB during the period of time it is required to operate.
T p,*
SHH/,*,bg CC: Director, URC Office of Inspection & Inforcement Director of Nuclear Reactor Regulation
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REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS' DISTRIBUTION FOR INCOMING MATERIAL 50-329/' _0 REC: KEPPLER J G ORG: HOWELL S H DOCDATE: 01/13/78 NRC CONSUMERS PWR DATE RCVD: 01/27/78 DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED
SUBJECT:
LTR 0 ENCL 0 FURNISHING FINAL RESPONSE TO IE BULLETIN 77-05A RE ELECT CONNECTOR ASSEMBLIES AND COVERING NSSS EQUIPMENT AS SUPPLIED BY THE B&W CO FOR THE SUBJECT FACILITY.
PLANT NAME: MIDLAND - UNIT 1 REVIEWER INITI AL:
XJM MIDLAND - UNIT 2 DISTRIBUTER INITIAL:
C****************
DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS ******************
PSAR/FSAR AMDTS AND RELATED CORESPONDENCE (DISTRIBUTION CODE B001)
FOR ACTION:
ASST DIR VASSALLO**LTR ONLY(1)
BRANCH CHIEF VARGA*<LTR ONLY(1:
PROJ MGR HOOD **LTR ONLY(1)
LIC ASST SERVICE **LTR ONLY(1)
INTERNAL:
- C0 "! LC - " L" 0" NRC PDR**LTR ONLY(1)
I & E**LTR ONLY(2)
OELD**LTR ONLY(1)
P.
COLLINS **LTR ONLY(1)
HOUSTON **LTR ONLY(1)
HELTEMES**LTR ONLY(1)
CASE **LTR ONLY(1)
MIPC**LTR ONLY(1)
KNIGHT **LTR ONLY(1)
BOSNAK**LTR ONLY(1)
SIHWEIL**LTR ONLY(1)
PAWLICKI**LTR ONLY(2)
ROSS**LTR ONLY(1)
NOVAK**LTR ONLY(1)
ROSZTOCZY**LTR ONLY(1) l CHECK **LTR ONLY(1)
TEDESCO**LTR ONLY(1) l BENAROYA**LTR ONLY(1)
LAINAS**LTR ONLY(1)
IPPOLITO**LTR ONLY(1)
F.
ROSA **LTR ONLY(1) l GAMMILL**LTR ONLY(2)
VOLLMER**LTR ONLY(1)
BUNCH **LTR ONLY(1)
J.
COLLINS **LTR ONLY(1) l KREGER**LTR ONLY(1)
KIRKWOOD**LTR ONLY(1)
EXTERNAL:
LPDR'S MIDLAND, MI**LTR ONLY(1)
TIC **LTR ONLY(1)
NSIC**LTR ONLY(1)
ACRS CAT B**LTR ONLY(16)
DISTRIBUTION:
LTR 54 ENCL 0 CONTROL NBR:
780270050 SIZE: 2P gg c**********************************
THE END
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