ML20058H652
| ML20058H652 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 12/03/1993 |
| From: | Simpkin T COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9312130168 | |
| Download: ML20058H652 (9) | |
Text
.
C, Commenwnith Edison e
1400 Opus Place '
Downers Grove, Ithnois 60515 i
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December 3,1993 Dr. Thomas E. Murley, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Subject:
Zion Nuclear Station Units 1 and 2 Second Interval Inservice Inspection Program Relief Requests NRC IlqcketNos. 50-295 and 50-304 l
Reference:
T. Simpkin letter to Dr. T. Murley dated August 19,1993
Dear Dr. Murley:
The Reference transmittal provided the following ISI Program relief requests:
1.
Hydro Relief Requests #11,12,13,14, and 15 t
2..
Technical Approach and Position #11 Hydro relief requests #11 and 12 proposed alternate examinations for buried lines. Hydro relief #13 addressed the examination requirements for the Auxiliary Feedwater Pump Turbine Oil Coolers, while Relief #14 requested alternate testing in l
lieu of the Code-required system hydrostatic test for the Auxiliary Feedwater piping i
associated with the turbine-driven pump. Hydro Relief #15 sought relief from the 6
hydrostatic test of the 1/2 " Isolation Valve Seal Water Piping.
Technical approach and Position #11 related to the hydrostatic test boundaries with respect to tubing downstream ofinstrument root causes.
The purpose of this letter is transmit additional information in support Hydro Relief Requests #13 and #14. Due to potential impact these relief requests will have on the upcoming Dual Unit Outage, approval is requested by December 31,1993.
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Dr. Murley December 3,1993 j
l If there are any questions or comments regarding this matter, please direct them to this office.
4 Sincerely,
]
l T.W. Simpkin i
Nuclear Licensing Administratc-1 Attachments
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J. B. Martin, Regional Administrator - RIII
.j C. Y. Shi,si, Project Manager - NRR l
J.D. Smith, Senior Resident Inspector - Zion 1
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i ATTACIIMENT A i
ADDITIONAL INFORMATION CONCERNING HYDROSTATIC TESTING
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RELIEF REQUESTS #13 AND #14
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Relief Request #13 The highlighted piping on drawings M-37 sheets 1 and 2, Attachment B, indicate which piping will NOT be hydrostatically tested for the Auxiliary Feedwater (AFW) suction piping hydrostatic test. This piping will be visually inspected at normal operating pressure. The AFW turbine bearing oil coolers cannot withstand the hydrostatic test-pressure. The oil coolers are within the highlighted piping segment (the oil coolers are vendor supplied and do not explicitly appear on the drawing). A VT-2 inspection will be performed in lieu of a hydrostatic test for this segment of piping.
Relief Request #14 Ilydrostatic testing relief was requested for the main steam piping upstream of check valves 1MS-0006 and IMS-0007 to the AFW steam supply valves.1MS-000G and IMS-0007 are Chapman split body valves which would require disassembly in order to i
pressurize the piping. These particular check valves are extremely difficult to i
reassemble correctly due to the difficulty in maintaining proper alignment of the valve internals while the body flanges are being mated. Drawings are included in Attaclunent B to illustrate the valve design. An incorrectly reassembled valve would result in steam leaks that normally require cooling down the plant to disassemble and i
reassemble the check valve once again. Furthermore, a walkdown of the steam piping shows that, due to structural concrete interference, there is little room to spring the piping to disassemble the check valve and install a blank flange. This lack of spring room would further complicate the reassembly of the check valve.
3 The check valves are located immediately inside the containment after the penetration.
The amount of piping that would not be hydrostatically tested per this relief rcquest is approximately 15 fbet. A VT-2 inspection of the piping has been performed with no leakage noted. It should be sted that the piping upstream of the AFW steam supply check valves only requires a VT-2 inspection.
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RELIEF REQUESTS #13 AND #14 i
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Titung Disc Check Vanes constat essentialty of a cylindncat housing.
- 1 with a pivoted orcular disc. The prets are located just above the Standard body design configurations:
center of the disc. and o*fset from the plane of the body seat. This The seat, disc and piwt pins are combined into one sub-asserrety design gfves a bell-CranM aChon to the 0:sC. The seat is of orcular secured to the intet side of the body wrm 3 locking nng in sizes 3* and e3 vet type and the disc crops in or out of contact wrmout rubbing or smaller. This construenon avoids the need for er! coding the pivot
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pns through the vaNo bocy.
The seat is formed on the end of the inlet body secDon by cobart base gg, alloy hard faang depostt in sizes d' and larger. The pivot pins Stamming of check vates :s the result of failure of the vane disc to supporting the disc are inserted through capped and gasketed reach its ctosed posrhon before the flud flow reversal. Titung disc beanng bosses in the outlet secDon of the body.
"1 check vanes have the ability to close rapety since the disc has a Special Design Configurations Available to Meet Requirement snorter distance to travel and therefore amms at the seat faster ofIndMdual Appilcations:
, minimizing a stam.
\\oke, Stem & Handwheel-a!!ows the disc to be open or closed
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Titting disc check valves are used to prewnt reversal of flow in against flow and also as means of lociong the cisc in the closed hunzontalor verticalspe lines in verocallines, or for any angle from postbon.
honzontal to veruca! they can be used for upward flow onty.
4 Titung eneck vates are automaticalty actuated. They are opened by Silp Unk-a provtsion for holding the disc in open posruon against rewrsalof flow.
whocity pressure, and closed by gravtry. Seatng load and tightness is dependent on back pressure. The disc and moving parts may Dash Pots-are offered using oil, eter or air for full control of the
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constantly move if the vetooty pressure is not sufficent to hold the disc speed, best surted to a part cular installat on. Fluid is used as q
vaNo in a wde open and stacle position. Premature wear and noisy dampening medium.
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operabon or vibration of the moving parts can be avoded by select-g ing me size of check vatve on the basis of flow cond bons. The Snubbers-mechanical snubbers are instafied whe e valve is sub-minimum velocity reouired to hold a tiltng disc check vahe wee jected to some stamming acDon due to intermrttent flow.
open and stabie can be determined by formula:
Piston Acutated Mechanism-for posittw closing in entical ap.
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V = BOW pkcaDon such as turbine extracton or bleederline service where y is equal to flow in feet per second and where 9 is the speerfic 1
volume of the flud in cubec feet per pound. Sizing check vatves on
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thts basis may otten resutt in the use of vanes that are smaller than
- 1. Body inlet Half
- 7. Body Stud Nuts the pipe in which they are used, necessitating the use of reducers for installation. The pressure drop will be not greater than that of the
- 2. Boey Outlet Half
- 8. Beanng Cap Gasket
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targer vane that is onty,ga11alty open, and vane life will be greatty
- 3. Dsc extended. The added boi1Dhcff course, is the lower costecif the['t 4. Prmt Pin E Beanng Cao rl smaller vane.
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- 5. Body Gasket
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check vale. Itis not entended to show att the c *ans vy and construccon at ad Crune eneck vanos.
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