ML19319C478
| ML19319C478 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 10/23/1975 |
| From: | Mazetis G Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8002190928 | |
| Download: ML19319C478 (2) | |
Text
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SC9fARY OF DAVIS-BESSE SITE VISIT - 10/16/75 1.
DH DROP LINE CONNECTION TO NOT LEC_
OK - At lowest part of hot leg piping.
2.
DH MOTOR-OPERATED ISOLATION VALVES IFSIDE CONTAD;MEYT & MA'RTAL BYPASS VALVES
- Motor-coerated valves will be underwater post-WCA but are in a watartirJ.ti compartment.
Compartment will have a watertight access hatch.
(Me nal bypass valves will not be in compart=ent).
3.
'JATERTICIIT ECCS PUMP ROOMS & LEAK DETECTION
- Observed a wall about 10 ft. high and no ceiling. Wall penetrations were not watertight (guida said not finished). Access was through stairs from top of rooms.
- Laak detection was from level alarm in a small sump in pump rooms.
- ECCS coolers for both trains are in same room.
4.
TYIICAL LPI & EBI PIPDIC VENTI'iC PROVI IIONS
- Examples looked at were not accessible. Guide indicated that reach rods were to be installed.
5.
ECCS PDT CASniG VENTD:G PROVISIONS
- CK 6.
LOCATION OF 24" MANUAL GATE VALVE ON BWST (DH79)
- Appears to be as close as practical to 3'JST.
7.
LPI-to-TGI CROSSOVERS
- If manual valves accepted by NRC thru Davis-Ecsse appeal, handwheels would have to be lowered or incorporate reach rods (too high).
8.
LPI-to-LPI CROSSOVER VALVES
- OK...if design accepted by URC af ter appeal.
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8002190 fM
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ECCS SU'@ AREA
- Single sump is too small to conduct a full flow test (
3500 gal.).
Sump construction not complete (reinforcing bar exposed), piping covered, anti-votax devices not installed.
1/4" mesh screen not installed. Cofferdam possibilities are limited by larger adjacent in-core guide tubes pit. ECCS sump is dwarfed by this pit. Cuide indicated that, although initini few feet of suction piping from sump are horizontal, the piping slopes upward slightly after the sump valves.
- 10. 3CRCN DILUTION I'ISTRDfE'1TATION
- Flow rate rasdout from the control room not available for all dilution modos. Availabic tecerature readout is proposed to provide operator of the prt.ser.cn of dilution flev.
G. Mazetis Reactor Systems Branch Division of Technical Review cc:
T. Novak R 3aer K. Parcze'nki L. En;;1e i
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Form AIC.318 (Rev. 9-53) ABCM 0240 W u. e. oovemmuswv painvine orrects sora.eae-see
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