ML19329E636

Forwards Comments & Request for Addl Info Re Classification of Components of Reactor Coolant Pressure Boundary Sys & Other Sys Discussed in Amend 26 to CP Application

ML19329E636
Person / Time
Site:	Midland
Issue date:	11/01/1974
From:	Schwencer A US ATOMIC ENERGY COMMISSION (AEC)
To:	Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
NUDOCS 8006160417
Download: ML19329E636 (5)

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'Cl 1 1574 Docket Nos. 50-32 and 50-330 q

THis DOCUMENT CONTAINS P0OR QUAUTY PAGES,

Cmsuners Power Company ATIN: Mr. S. II. Howell Vice President 212 West Michigan Avenue Jackson, Michigan 49201

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Gentlemen:

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We have reviewed Wt 26 to your application on the Midland Phant, Units 1 and 2.

Our review of this==wknt, consisting of revisions to the Preliminary Safety Analysis Report, is directed to your empliance with the Seismic Classification and Quality Group C1sssification of thore water and steam containing caponents

. which are part of the reactor coolant pressure bomanry and to other fluid systems important to. safety.

7 Enclosed you will find the staff's er-ents and requests for additional information relative to compcment classifiention. 'Ibe staff's cosaments -

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i' are intended to augment the classification guidelines presently avail-able for your use. '!he requests for additional information are needed to clarify and amplify the information you have previously submitted in AmmAnant 26.

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~ In summary, until we receive the additional information requested, we l

cannot emplete our review of the Seiwic and Quality Group C Classifi-catica of the Component Cooling Water System for the Midland Plant, Units 1 and 2.

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-t Please contact us, if you.have any questions regarding the staff's

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i ccs: Harold F. Reis, Esquire DISTRIBUTION:

Newman, Reis, Axelrad Docket Files 1

1025 Connecticut Avenue, N. W.

AEC PDR Washington, D. C.

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LWR 2-3 Reading Honorable William H. Ward VMoore Assistant Attorney General FSchroeder Topeka, Kansas 66601 AKenneke RKlecker Howard J. Yogel. Esquire R0 (3) l Knittle and Vogel

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.. m REQUESTS-FOR INFORMATIC:1 At:D C0!'MENTS-PURSUAllT -TO THE MIDLAUD PLAUT, UNIT 5 T AND 2

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AMENDMENT 26~, SECTION 4.2.2.4 AND FIGURE 4.1-1 1.

In Figure 4:1-1, you indicate tha't components in Quality Group C may be either Seismic Category I or Category II.

Ilowever, for systens designated ASME III, class 3 (Quality Group C), there is no indication of the applicable seismic category.

Revise Figure 4.1-1 to clearly define the scismic category applicable to all Quality Group C systems and components.

2.

In Figure 4.1-1, construction of the feedwater rir.g header in accordance with At:SI B31.1.0 is not acceptable.

This portion of the feedwater system should be constructed in accordance with ASME Section III, class 2.

3.

In Figure 4.1-1, construction of.the reactor coolant pump seal water injection piping in accordance with ASME III, class 3 is not acceptable.

These lines should be constructed in accordance with AS!'.E III, class 2, 4.

In Section 4.2.2.4, the specified 19.4 minutes after ioss of CC'd required to da er.ergin: the reactor :Oci:r.t pure to insure a darage-free coastdown is cnnsidered acceptable.

In order that a r.ny review your analysis, provide a detailcd description of the calculation procedure including the following:

a.

The equations used i

b.

The parameters used in the equations, such as:

the design parameters for the notor bearings, motor, pu.rp and any other equipment entering into the calculatin r, and eaterial property values for the oil and metal parts i

c.

A discussion of the effects of possible variations in part dimensions and material propertics, such as, bearing clearance tolerances and misalignment d.

A description of the cooling and lubricatien systens

- (with appropriate figures) associated with the reactor coolant pump and cotor and the applicable design criteria and standards 1

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Information to verify the applicability of the equations and material properties chosen for the analysis (i.e., references should be listed, and if empirical relations are used, provide a ccm-parison of their rance used in the analysisI. of application to the range Maddition provide an analysis assessing the safety consec,uances to the Reactor Coolar.t Systea should no action be taken fcllo<;ing the loss of ccmponent cool-ing water.

5.

In Figure 4.1-1, the Quality Group D classification of the ccoling water lines to and free the 1ctdown coolers cannot be consic;ered acceptable until a'dditional infor-mation is presented.

To facilitate the staff's consid-

'cration of the acceptability of Quality Group D cooling lines, provide.th,e follouing:

a.

A detailed analysis of the effects.of a complete loss of cooling water to the letdown. coolers.

Provide ;11 (quations, assumpticas, systca parc.-

meters and tattrial properties used to conservat"zely calculat.e the resulting trporature and pressure increases throughout the makeup systca.

Provide

a. system diagram for reference in the calculations.

b' The various times at which system alarms would be activated following a significant break in the CCUS.

Assuming the letdown spster is'isciated after one c.

of the alarns is activated, provide the calculations showing tha events which would occur af ter letdown isolation.

d.

Indicate.the tires at which alarms would signal various conditions and indicate the maximum time that the systea could continue to operate with the letdown syst:m isolated.

Describe the system monitors that would signal the necessity to shutdown o.r to take further action.

Describe in detaii the sub-sequent shutdown precedure for this situation.

Dis-cuss -any di f ferenc as ia the shutdown precedura f: e -

the normal proccdure.

c.

Assuaing that the !ctdcen systen is not isclated after ute alarms are activ.: red, consid: r t he re-sulLing cons?quence: to ti'c ' c.v.fca a:nl i t.; cennonen t c.

Provide calculaticas indicating the Lit.e at t.hich

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system temperature or pressure would reach levels which would interfere with the normal operation of'the filters, demineralizers, makeup tank, cake-up pump, reactor coolant pump and seals and asso-ciated piping.

Indicate any system alarms which

-would activate during this situation.

Discuss in detail any differences in shutdown procedures required depending on whether the letdo'.in system is isolated or not.

6.

In Figure 4.'l-1, the Quality Group D classification of the cooling water piping to and from the seal return coolers connot be considered acceptable until additional information is presented.

Provide a complete analysis of the effects of loss of cool-ing water to.the seal return ecclers as outlined in item 21.5 above.

In addition, provide a compicte analysis of tb.e effects of simultaneous loss of cooling y:ater to both the. letdown and seal return

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