ML20037D249
| ML20037D249 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 05/26/1981 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8105290170 | |
| Download: ML20037D249 (10) | |
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v south CAROLINA ELECTRIC & gas COMPANY POST OFFICE SOa 7s4 CotuMaiA, Souin CAnouMA 29218 D
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May 26, 1981 4
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.g Mr. Harold R. Dc ston, Director 9
Office of Nucles Reactor Regulation U. S. Nuclear Pt ;ulatory Cccmission Washington, D. C-20555 Stbject: Virgil C. Sumer Nuclear Station Oceket No. 50/395 Radwaste Solidification Process Control Program.
SER Confirmatory Issue 1.7.17.
Dear Mr. Denton:
In our Septc.ber 25, 1980 letter, South Carolina Electric and Gas Camany stbmittc i the radwaste solidification instruction manual. By this letter, we are s httitting the radwaste solidification " Process Control Program". 'Ihis bcturent, together with the previously supplied instruction manual, providet the details of operation of the radwaste solidification system for the Y'rgil C. Strner Ntriear Station.
This infornr. ion, togettar with the radiological technical specifications which will be tresmitted to you in approxinutely one nonth, should provide sufficient info 2 ation to close out SER confirnatory issue 1.7.17.
t If you have.ny questions, please let us know.
Very truly yours, a
a T. C. Nichols, Jr.
RBC:'ICI:pj Attachment cc: V. C. Stnne w/att.
O. S. Bradham w/att.
G. H. Fisch r w/att.
ISEG w/att.
T. C. Nicho 1, Jr. w/att.
NPCFAhitaker w/att.
Dr. John Ru if w/att.
File w/att.
D. A. Nauma w/att.
PRS w/att.
W. A. Willi -ms, Jr. w/att.
H. E. Yoccm R. B. Clary w/att.
A. R. Koon /att.
A. A. Smith w/att.
H. N. Cyrus w/att.
O.,
J. B. Knott 0, Jr. w/att.
,/
J. L. Skold3 w/att.
B. A. Burse / w/att.
M O170
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i VIRGIL C. SUMMER NUCLEAR STATION DOCKET No. 50/395 RADWASTE SOLIDIFICATION SYSTEM PROCESS CONTROL PROGRAM
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l TABLE OF CONTENTS 1.0 PURPOSE 2.0 SYSTEM DESCRIPTION 2.1 CONTROLS 2.2 RADIATION MONITORING j
3.0 SAMPLE COLLECTION 3.1 SAMPLE FREQUENCY I
3.2 SAMPLING METHOD AND RADIOLOGICAL CONSIDERATIONS l
3.3 SOLIDIFICATION DOCUSENTATION i
4.0 TEST SOLIDIFICATION AND ACCEPTANCE CRITERIA i
4.1 GENERAL REQUIREMENTS 4.2 TEST SOLIDIFICATION j
4.3 SOLIDIFICATION ACCEPTABILITY 4.4 ALTERNATE SOLIDIFICATION PARAMETER SELECTION i-ATTACHMENT I:
DATA SHEET PCP-1 f
ATTACIDiENT II: DATA SHEET PCP-2 a
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O 1.0 PURPOSE The purpose of the Process Control Program is to provide assurance of 4
the satisfactory solidification of wet radioactive vaste and of the absence of significant free-standing liquid prior to transport'and disposal.
2.0 SYSTEM DESCRIPTION The radwaste solidification system utilizes urea formaldehyde to convert all types of wet radioactive waste (filter s,ludges, spent resins, evaporator bottoms, and boric acid) into a solid matrix.
The solidification system re-i ceives vaste in the waste blending tank where it is blended and adjusted for pH.
The waste is then transferred to the disposable liner where it is mixed with appropriate quantities of urea formaldehyde concentrates and urea catalyst. Mixing in the blending tank is accomplished mechanically and in i
the liner by means of an air sparger.
Off gas venting and dewatering con-i nections are provided on both the blending tank and the liner.
2.1 Controls The twelve automatically operated processes are controlled by the Waste and Process Select Control Switches. Once the. operator has selected 1
the process and pushed the start button, that process is virtually automatic. When a process is complete, the next pi.,- s is initiated until the solidification operation is complete.
There are numerous automatic process alarms, switches, and indicators which provide feedback and assurance of proper operation of the system.
f Among the more important are:
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1.
Level probe on the liner; 2.
Flow detectors on solidification agent, catalyst, dewatering, and radwaste discharge lines; 3.
Pressure switches in the solidification agent, catalyst, dewatering, and radwaste discharge lines; 4.
Pressure switches in the vent discharges; 5.
Radiation monitors in the blending tank and liner areas; 6.
Heaters and temperature probe on the blending tank.
2.2 Radiation Monitoring A radiation monitor is located on the wall of the control cubicle to alert the operator in the event of excessive radiation.
Two radiation sensors are located in the fill cubicle.
One detects radiation levels at the container or shield surface and the other six feet away.
An-other radiation sensor detects levels in the waste blending tank area.
If excessive radiation levels exist, an alarm sounds and the fill opera-tion automatically terminates.
3.0 SAMPLE COLLECTION 3.1 Sample Frecuency_
For each new shipment of chemicals and periodically during storage, the urea formaldehyde concentrates and catalyst are to be sampled.
Each fill operation of the waste blending tank is considered to be a batch.
Sampling and Test Solidification is to be performed on the first batch and every tenth batch of the same type of waste.
If a test'
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sample does not meet the acceptance criteria, alternate solidification parameters are to be determined'until a subsequent test is acceptable.
4 After the alternate solidification parameters are placed into effect,
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a sample shall be taken and solidified from each of the next batches i
Acceptsble test solidification for three of that same type of waste.
j consecutive batches of that type of waste will result in the sampling requirement reverting again to every tenth batch.
3.2 Sampling Method and Radiological Considerations Sampling from the UFC day tank shall be taken after the mixer has had a sufficient time of operation, j
s Sampling from the waste blending tank shall be performed during the re-circulation mode af ter the batch has been adjusted for pH.
Acceptable test solidification shall be obtained before the batch is solidified.
All samples of waste cust be handled according to established health physics procedures.
Disposal of all solidified test samples is to be under the direction of Health Physics.
l 3.3 Solidification Documentation i
Data sheets (see Attachments 1 and 2) will be used to collect and main-tain data from each test sample.
The following infermation is required on each test sample.
1.
Waste Type 2.
datch Number 3.
Waste Received in Blending Tank
. _ _. _ _. _ _. ~. _ -,. _. _ - -,. _.... _ _ _.
4.
Initial pH 5.
Sodium Hydroxide Added 6.
Sulfuric Acid Added 7.
Final pH 8.
Waste Oil Content (percent visual from sample) 9.
Total UFC Added 10.
Waste /UFC Ratio 11.
Total Catalyst Added 12.
Catalyst /UFC Ratio 13.
Liner Mixing Time (if not 8 minutes) 14.
Quantity of FSL A batch number will range from 1 through 10 and on the tenth batch of each type of waste, the solidification parameters will be confirmed again by sample solidification.
4.0 TEST SOLIDIFICATION AND ACCEPTANCE CRITERIA 4.1 Ceneral Requirements For standard ratios of waste, solidification agent, and catalyst, refer j
l to the operational instruction manual.
l If visual oil checks indicate concentration greater than one percent, attempts to remove the oil are to be initiated.
4.2 Test Solidification The waste sample is to be maintained at the same temperature as the waste in the blending tank during data collection and preliminary tests.
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The test vessel is to have some means of mixing.
The appropriate ratios of solidification agent and catalyst are to be added to the waste sample with mixing to continue until solidifica-tion begins.
If any free-standing liquid is noted, transfer and nessure its quantity.
i Calculate and' record the amount of free liquid.
4.3 Solidification Acceptability The sample solidification will be considered acceptable if the amount of free liquid is equal to or less than 0.5 percent by volume or one j
gallon equivalent for the liner, whichever is less.
(Note: sac:ple solidification is acceptable if free liq 2id amounts to 1 percent or less when using a high integrity container.)
The waste solidification will be considered acceptable from a solid mass standpoint if it is evident from its physical appearance that
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the solidified waste will maintain its shape if removed from the vessel.
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4.4 Alternate Solidification Parameter Selection I
If one or more of the above criteria is not met, additional solidifi-i cation parameters must be determined through additional tests. During l
l subsequent tests, solidification parameters are adjusted and recorded until an acceptable test ts obtained.
The new parameters are then in-stituted for the solidification of all that type of waste.
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o ATTACHMENT I DATA SHEET PCP-1 Shipment f Date Received Solidification chemical test and acceptance criteria: Complete and sign t
below.
1.0 Urea Formaldehyde Concentrate 1.1 Specific Gravity (acceptable if between 1.280 and 1.310) 1.2 Urea Formaldehyde pH (acceptable if between 7.4 and 7.7) 2.0 Urea Catalyst 2.1 Specific Gravity (acceptable if g 1.83) 2.2 Urea Cata3yst Color (acceptabic if cicar)
Operator Date 4
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ATTACIDIENT II DATA SHEET PCP-2 Batch Number Waste Type Liner Shipment Number i
i Solidification test and acceptance criteria; complete and sign below:
I 1.0 Batch pH adjustment i
1.1 Initial pH I
1.2 Sodium Hydroxide Added 1.3 Sulfuric Acid Added i
t 2.0 Test Sample 2.1 Sample pH (acceptable if between 5.5 and 6.~5) 4 2.2 Sample Volume ml 2.3 Temperature OF (must be above 1100F) 2.4 Waste 011 Content
% (must be less than 1%)
3.0 Test Solidification ml 3.1 Volume Urca Formaldahyde Concentrates l
l 3.2 Volume Urea Catalyst ml 3.3 Total Test Volume ml l
l 3.4 Waste /Urca Formaldehyde Ratio i
3.5 Urea Formaldehyde / Catalyst Ratio i
4.0 Free-Standing Liquid 4.1 Volume of Decanted Liquid ml
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4.2 Liquid / Total Test Volume 4.3 Equate Test Liquid Volume to Liner Type and Volume l
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5.0 Physical Appearance Verify Physical Appearance 6.0 Liner Solidification 6.1 Total Volume of Waste gal.
l Urea Formaldehyde Concentrates Added 6.2 l
6.3 Urea Catalyst Added j
6.4 Sparging Air Pressure 6.5 Sparging Time I
Verify Solidificarica has gone to completion and residual free-7.0 standing liquid limits are acceptable.
Date Operator
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