ML20137Q181
| ML20137Q181 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 09/16/1985 |
| From: | Papanic G YANKEE ATOMIC ELECTRIC CO. |
| To: | Zwolinski J Office of Nuclear Reactor Regulation |
| References | |
| FYR-85-98, NUDOCS 8509200060 | |
| Download: ML20137Q181 (3) | |
Text
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YANKEE ATOMIC ELECTRIC COMPANY Te'ephone (6 ") 8 ' - 'oo TWX 710 380-7619
,,c-1671 Worcester Road Framingham, Massachusetts 01701 2 C.2.1
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FYR 85-98 fn /- Jd tC E b,-
September 16, 1985 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Mr. John A. Zwolinski, Chief Operating Reactors Branch No. 5 Division of Licensing
References:
(a) License No. DPR-3 (Docket No. 50-29)
(b) YAEC Letter to USNRC, dated August 16, 1985 (c) " Mixing of Emergency Core Cooling Water With Steam:
1/14 Scale Testing Phase," EPRI-294-2, Key Phase Report, January 1975 (d) " Mixing of Fmergency Core Cooling Water With Steam:
1/3 Scale Test and Summary," EPRI-294-2, Final Report, June 1975
Subject:
LOCA InjectionAP Penalty
Dear Sir:
Yankee Atomic Electric Company proposed to replace the currently approved injection A P penalty of 0.8 psid during pumped ECCS flow by an injectionA P penalty of 0.15 psid. The justification for the proposed change was provided in Reference (b).
The NRC staff has reviewed Reference (b) and has requested additional information which is provided herein.
The proposed injection AP penalty was based on the experimental evidence reported in References (c) and (d).
All the data obtained with the pumped ECCS flow conditions were used in arriving at the proposed injection AP penalty of 0.15 psid. The relevant reflood phase parameters (core pressure, steam momentum, ECC injection velocity, ECC water temperature) expected for the Yankee plant were compared against the test conditions. All of the above parameters, except the ECC injection flow velocity, are within the range of test ecnditions.
ECC injection velocity was varied between 1 and 16 fps in tha test as, opposed to 45 fps expected in Yankee. References (c) and (d) were reviewed and it was concluded that a lower injection AP penalty should be expected for higher injection velocities bounding the proposed injection AP penalty of 0.15 psid.
The NRC staff reviewed our submittal and pointed out that Reference (c) also included tests at injection water velocities of 40 and 70 fps.
They requested that these results should also be reviewed.
i 8509200060 850916 PDR ADOCK 05000029 P
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United Stst03 Nucloce R:gultt:ry Commie 3 ion September 16, 1985 Page 2 Table 1 provides the results of our review. An injection water velocity of 45 fps is expected in the Yankee plant. Therefore, only 40 fps injection water velocity data were included in our review. The last column in Table 1, DP10-DP9, represents the cold les pressure drop. This pressure drop includes the pipe frictional loss which should be appropriately subtracted from (DP10-DP9) to obtain the injectionAP penalty. Since a higherA P penalty yields conservative flooding rates, the pipe frictional loss was conservatively neglected in our calculations and (DP10-DP9) is reported as the injection A P penalty.
All data with 40 fps injection velocity is reported in Table 1.
Thirteen out of 16 data points showed zero or negative pressure drop for the injection AP penalty (DP10-DP9). The remaining three points are bounded by the proposed injectionA P penalty of +0.15 psid. The use of the proposed AP penalty during Pumped ECC injection is based on applicable, experimental data and is therefore in compliance with Appendix K requirement I.D.4.
Very truly yours,
.M George apanic, Jr Senior Project Engineer - Licensing CP/dps i
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TABLE 1 l
l Inj. Water Steam Ref/Run Pressure Velocity Mom-Flux DP10 DP9 DP10-DP9*
PSI fos PSI PSI PSI PSI 4/2-15 20.0 39.6 1.078 0.0 0.0 0.0 8/2-19 20.1 40.3
.122 0.0 0.0 0.0 25/2-36 59.8 40.3 1.132 0.0 0.0 0.0 26/2-37 59.7 40.50
.663 0.0 0.0 0.0 27/2-38 59.3 40.50
.136 0.0 0.0 0.0 262/4-55 59.7 40.65
.86
-0.13 0.8
-0.93 263/4-55 60.5 40.76 0.816
-0.12 0.75
-0.87 264/4-55 59.7 40.79 0.854
-0.13 0.78
-0.91 265/4-56 59.2 40.58 0.542
-0.02 0.55
-0.57 266/4-56 60.3 40.38 0.510 0.01 0.45
-0.44 267/4-56 59.0 40.58 0.576 0.0 0.53
-0.53 268/4-57 59.8 40.52 0.335 0.09 0.33
-0.24 l
269/4-57 59.7 40.50 0.340 0.09 0.34
-0.25 270/4-58 59.7 40.52 0.107 0.18 0.08
+.10 271/4-58 58.6 40.51 0.143 0.17 0.13
+.04 272/4-58 59.2 40.49 0.120 0.19 0.10
+.09
- In3ection aP Penoity I
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1 I
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