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Change Rept 15 to License DPR-4,describing Mods to Pressurizer Safety Relief Valve Installation
	ML20085F989
Person / Time
Site:	Saxton File:GPU Nuclear icon.png
Issue date:	11/13/1968
From:	Neidig R; SAXTON NUCLEAR EXPERIMENTAL CORP.
To:	;
Shared Package
ML20083L048	List: ML20085C449; ML20085C452; ML20085C455; ML20085C458; ML20085C461; ML20085C464; ML20085C467; ML20085C472; ML20085C477; ML20085C480; ML20085C483; ML20085C490; ML20085C500; ML20085C501; ML20085C504; ML20085C508; ML20085C513; ML20085C517; ML20085C540; ML20085C543; ML20085C546; ML20085C583; ML20085C586; ML20085C590; ML20085C592; ML20085C602; ML20085C605; ML20085C616; ML20085C620; ML20085C622; ML20085C625; ML20085C628; ML20085C630; ML20085C633; ML20085C634; ML20085C637; ML20085C805; ML20085C809; ML20085C826; ML20085C835; ML20085C840; ML20085C844; ML20085C904; ML20085C913; ML20085C966; ML20085C973; ML20085D041; ML20085D048; ML20085D052; ML20085D059; ... further results
References
	FOIA-91-17 NUDOCS 9110240075
	Download: ML20085F989 (8)
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DOCC,71;0. 50-146 LICEISE DPP-4 CFMGE P2 PORT NO.15

1. Applicant hereby outnits Change Report flo.15 in compliance with paragraph 3(C) of License DPR-4. This report describes modifications ,

made to the precsuri cr safety relief valve installation.

SAXTOI !dCIEAR EXPERIFSITAL CORPORATION By /s/ R.E.Neidig it. J. licia. President

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9110240075 910424 PDR FOIA DEv:OK91-17 PDR C'? C

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Docket No. 50-146 DPR-4 Change Report No. 15 CHANGE NOTICE FOR THE INSTALLATION OF NEW PRESSURIT.ER SAFETY VALVES AND PATER SEALS s

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f8 Docket No. $0-146 DPR-4 Change Report No. 15

Page 1 of 2 l

l CitANGE NOTICE FOR T}lt INSTALLATION OF NEW PRESSURIZER SAFETY VALVES AND WATER SEALS gescription of Change The Pressurizer Sulety Valves PSV 372 and PSV 371 are to be flanged and re-installed with watet seals. Further, at the first opportunity the valves will be rep 4 aced with the new safety valves a drawing of which is shown in Figure 1.

Some of the valve operating parameters are given in Table 1, and a list of valve material specifications in Table 2.

---Purpose of Change The present safety valves have leaked frequently resulting in severe errosion of the seating surfaces and considerabic delays during. plant startups. Te eliminatt these delays water seals and new valves will be installed. The water seal will provide a trap to keep the steam and gas which collect in the pressurizer away from the valves and thus allow the valves to be kept cooler. Figure 2 is a schemati of tne Pressurizer Relief System showing the water seals.

Safety Considerations

^!!uta2SS_21. leis Eri t r_e f _PIleaIZ_S ys teg The design of the piping system from the pressurizer to the Pressure Relief Tank is in accordance with the USAS B31.1 Code for Pressure Piping. In addition the I.

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valves satisfy the requirements of Article 9 of Section III of the ASME Boiler and Pressure Vessel Code. ,. ,' ( d,$, lq ,, , ~1 n,4. u w l

The integrity.of the Primary System after the installation of the water seals and flonges will be assured by conforming to the folicering code requirements:

1. Welders and weld procedures will be qualified in accordance with ASME Boiler and Pressure Vessel Code,Section IX.

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Docket No. 50-146 DPR-4

Change Report No. 15 Page 2 of 2 4

2. Root and final pass of all welds shall be liquid penetrant inspected and all butt welds shall be 100% radiographically inspected. The procedure and acceptance standards shall be in accordance with ASME Par. N-627 m and N-624 r J of Section 111 Nuc1 car Vessels for liquid penetrant and radiographic inspection respectively.

Conf armance to the above requirements will be assured by the Nuclear Power Services Department of Westinghouse.

arther, the Primary System will be tested at a p s y of 2,40 h sig, while ,

ne pressure reitef valves are gagged. The prettsbrs test is not a code require-ment but is being conducted to provide an added degree of assurance of system integrity.

No additions or modifications to the pressure relief valve piping will be in-stituted without complete assurance of adequacy of design.

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TABLE 1 l'

PRESSURIZER SAFETY VALVES 4

BODY C' ,

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O Hateriait Stainless Steel '

Size: inlet, 1-1/2; Outlet, 2-1/2 End Connection Type: Inlet, Flange; Outlet, Flange Oritice Designation F USAS Rating: 1500 lbs.

TRIM MATERIAL Seat 6 Disc.: Seat, **; Disc., **

Guide & Ring (s): **

Spring: **

ACCESSORIES Levert Yes; Packed r,

Cagt Yea ,,I Balanced BelJows: Yes [M.j s-p

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SERVICE CONDITIONS y [ p{dC j Fluid: Sat. Steam; Radioactivityt Yes NhD Required Capacity and Units: 24,000 lbs/hr -N f , ';

Pressure Psigt Normal, 2250; Qieving, 2485 .,

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) Temperature O F: Relieving, 650 0F Developed Back Prrasute: 110 t,, j, h f/ ,7, Spring Set Pressures 2485 Overpressure - %: 3.70 '

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Design Pressure: P sig , 2 500 inle t -- ---...- - ,_

Design Temperaturet 650 F inlet , . , 2 [b '

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Blowdown 5%

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ML20085F989

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